Protesters use a fire extinguisher against a police formation during clashes outside the parliament in Athens, Monday, Jan. 14, 2019. Greek riot police have used tear gas to disperse rioting state schoolteachers, days after the country's public order minister criticized officers for allegedly using "indiscriminate" violence against protesting schoolteachers in similar circumstances. (AP Photo/Yorgos Karahalis)

Protesters try to avoid tear gas thrown by the police during clashes outside the parliament in Athens, Monday, Jan. 14, 2019. Greek riot police have used tear gas to disperse rioting state schoolteachers, days after the country's public order minister criticized officers for allegedly using "indiscriminate" violence against protesting schoolteachers in similar circumstances. (AP Photo/Yorgos Karahalis)

Protesters clash with policemen during a rally outside the parliament in Athens, Monday, Jan. 14, 2019. Greek riot police have used tear gas to disperse rioting state schoolteachers, days after the country's public order minister criticized officers for allegedly using "indiscriminate" violence against protesting schoolteachers in similar circumstances. (AP Photo/Yorgos Karahalis)

Protesters clash with policemen during a rally outside the parliament in Athens, Monday, Jan. 14, 2019. Greek riot police have used tear gas to disperse rioting state schoolteachers, days after the country's public order minister criticized officers for allegedly using "indiscriminate" violence against protesting schoolteachers in similar circumstances. (AP Photo/Yorgos Karahalis)

Policemen use tear gas against protesters during a rally outside the parliament in Athens, Monday, Jan. 14, 2019. Greek riot police have used tear gas to disperse rioting state schoolteachers, days after the country's public order minister criticized officers for allegedly using "indiscriminate" violence against protesting schoolteachers in similar circumstances. (AP Photo/Yorgos Karahalis)

Protesters clash with policemen during a rally outside the parliament in Athens, Monday, Jan. 14, 2019. Greek riot police have used tear gas to disperse rioting state schoolteachers, days after the country's public order minister criticized officers for allegedly using "indiscriminate" violence against protesting schoolteachers in similar circumstances. (AP Photo/Yorgos Karahalis), APTOPIX

Protesters clash with policemen during a rally outside the parliament in Athens, Monday, Jan. 14, 2019. Greek riot police have used tear gas to disperse rioting state schoolteachers, days after the country's public order minister criticized officers for allegedly using "indiscriminate" violence against protesting schoolteachers in similar circumstances. (AP Photo/Yorgos Karahalis)

Protesters clash with policemen during a rally outside the parliament in Athens, Monday, Jan. 14, 2019. Greek riot police have used tear gas to disperse rioting state schoolteachers, days after the country's public order minister criticized officers for allegedly using "indiscriminate" violence against protesting schoolteachers in similar circumstances. (AP Photo/Yorgos Karahalis)

Striking contract teachers and students escape tear gas during a demonstration in front of the Greek parliament in Athens on January 14, 2019. - Teachers rally to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Louisa GOULIAMAKI / AFP)

Striking contract teachers and students cover their faces as riot police forces use tear gas during a demonstration in front of the Greek parliament in Athens on January 14, 2019. - Teachers rally to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Louisa GOULIAMAKI / AFP)

Riot police forces use tear gas during a demonstration held by striking contract teachers and students during a demonstration in Athens on January 14, 2019. - Teachers rally to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Aris MESSINIS / AFP)

A riot policeman looks at a demonstrator lying on the ground as they clash with striking contract teachers and students during a demonstration in front of the Greek parliament in Athens on January 14, 2019. - Teachers rally today to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Louisa GOULIAMAKI / AFP)

Riot policemen spray water at a demonstrator as they clash with striking contract teachers and students during a demonstration in front of the Greek parliament in Athens on January 14, 2019. - Teachers rally today to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Louisa GOULIAMAKI / AFP)

Students clash with police amid tear gas during a demonstration in front of the Greek parliament in Athens on January 14, 2019. - Teachers rally today to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Louisa GOULIAMAKI / AFP)

Striking contract teachers and students and media try to escape tear gas during a demonstration in front of the Greek parliament in Athens on January 14, 2019. - Teachers rally today to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Louisa GOULIAMAKI / AFP)

Protesters and media try to escape from tear gas, after striking contact teachers clashed with police during a demonstration in front of the Greek parliament in Athens on January 14, 2019. - Teachers rally today to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Louisa GOULIAMAKI / AFP)

Protesters and media try to escape from tear gas, after striking contact teachers clashed with police during a demonstration in front of the Greek parliament in Athens on January 14, 2019. - Teachers rally today to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Louisa GOULIAMAKI / AFP)

Striking contract teachers and students clash with police during a demonstration in front of the Greek parliament in Athens on January 14, 2019. - Teachers rally today to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Louisa GOULIAMAKI / AFP)

Students clash with police amid tear gas during a demonstration in front of the Greek parliament in Athens on January 14, 2019. - Teachers rally today to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Louisa GOULIAMAKI / AFP)

Striking contract teachers clash with police during a demonstration in front of the Greek parliament in Athens on January 14, 2019. - Teachers rally today to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Louisa GOULIAMAKI / AFP)

Striking contract teachers and students clash with police during a demonstration in front of the Greek parliament in Athens on January 14, 2019. - Teachers rally today to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Louisa GOULIAMAKI / AFP)

Striking contract teachers and students clash with police during a demonstration in front of the Greek parliament in Athens on January 14, 2019. - Teachers rally today to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Louisa GOULIAMAKI / AFP)

Protesters clash with police during a demonstration in front of the Greek parliament in Athens on January 14, 2019. - Teachers rally today to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Louisa GOULIAMAKI / AFP)

Students clash with police during a demonstration in front of the Greek parliament in Athens on January 14, 2019. - Teachers rally today to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Louisa GOULIAMAKI / AFP)

Striking teachers shake a police bus parked to from a blockade during a demonstration in front of the Greek parliament in Athens on January 14, 2019. - Teachers rally today to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Louisa GOULIAMAKI / AFP)

A teacher shouts at police during a demonstration in front of the Greek parliament in Athens on January 14, 2019. - Teachers rally today to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Louisa GOULIAMAKI / AFP)

Protesters argue with a policeman during a demonstration in front of the Greek parliament in Athens on January 14, 2019. - Teachers rally today to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Louisa GOULIAMAKI / AFP)

Teachers and students shout slogans during a demonstration rally to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Athens on January 14, 2019. (Photo by Aris MESSINIS / AFP)

Teachers and students shout slogans during a demonstration rally to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Athens on January 14, 2019. (Photo by Aris MESSINIS / AFP)

Students clash with riot police during a demonstration in front of the Greek parliament in Athens on January 14, 2019. - Teachers rally today to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Aris MESSINIS / AFP)

Students clash with riot police during a demonstration in front of the Greek parliament in Athens on January 14, 2019. - Teachers rally today to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Aris MESSINIS / AFP)

Students clash with riot police during a demonstration in front of the Greek parliament in Athens on January 14, 2019. - Teachers rally today to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Aris MESSINIS / AFP)

Students clash with riot police during a demonstration in front of the Greek parliament in Athens on January 14, 2019. - Teachers rally today to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Aris MESSINIS / AFP)

Students clash with riot police during a demonstration in front of the Greek parliament in Athens on January 14, 2019. - Teachers rally today to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Aris MESSINIS / AFP)

Students clash with riot police during a demonstration in front of the Greek parliament in Athens on January 14, 2019. - Teachers rally today to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Aris MESSINIS / AFP)

Riot police spray water at students as they clash during a demonstration in front of the Greek parliament in Athens on January 14, 2019. - Teachers rally today to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Aris MESSINIS / AFP)

A protestor runs away from tear gas during a demonstration in front of the Greek parliament in Athens on January 14, 2019. - Teachers rally today to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Louisa GOULIAMAKI / AFP)

Students and teachers clash with riot police during a demonstration in front of the Greek parliament in Athens on January 14, 2019. - Teachers rally today to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Aris MESSINIS / AFP)

Students and teachers clash with riot police during a demonstration in front of the Greek parliament in Athens on January 14, 2019. - Teachers rally today to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Aris MESSINIS / AFP)

Teachers and students clash with riot police during a demonstration in front of the Greek parliament in Athens on January 14, 2019. - Teachers rally today to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Aris MESSINIS / AFP)

Teachers and students clash with riot police during a demonstration in front of the Greek parliament in Athens on January 14, 2019. - Teachers rally today to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Aris MESSINIS / AFP)

Teachers and students stand in front of riot police during a demonstration in front of the Greek parliament in Athens on January 14, 2019. - Teachers rally today to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Aris MESSINIS / AFP)

Riot police forces use tear gas during a demonstration held by striking contract teachers and students in Athens on January 14, 2019. - Teachers rally to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Aris MESSINIS / AFP)

Students and teachers clash with riot police during a demonstration in front of the Greek parliament in Athens on January 14, 2019. - Teachers rally today to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Aris MESSINIS / AFP)

A protester hides from riot police as they clash during a demonstration in front of the Greek parliament in Athens on January 14, 2019. - Teachers rally today to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Aris MESSINIS / AFP)

Teachers and students shout slogans during a demonstration in front of the Greek parliament in Athens on January 14, 2019. - Teachers rally today to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Aris MESSINIS / AFP)

Striking teachers hod a banner as they march past police blockade during a demonstration in front of the Greek parliament in Athens on January 14, 2019. - Teachers rally today to call for the withdrawal of a legislation making changes to the way educators are appointed in the public school system in Greece. (Photo by Louisa GOULIAMAKI / AFP)