Police investigate the remains a a car bomb at the General Francisco de Paula Santander Police Academy after an attack, in Bogota, Colombia, Friday, Jan. 18, 2019. Colombia blames the National Liberation Army, ELN, rebels for the deadly attack that left more than 20 dead and wounded many others. (AP Photo/John Wilson Vizcaino)

Police inspect a truck outside the General Francisco de Paula Santander Police Academy a day after a car bomb exploded at the site, in Bogota, Colombia, Friday, Jan. 18, 2019. Colombia blames the National Liberation Army, ELN, rebels for the deadly attack that left more than 20 dead and wounded many others. (AP Photo/John Wilson Vizcaino)

Police inspect a truck outside the General Francisco de Paula Santander Police Academy a day after a car bomb exploded at the site, in Bogota, Colombia, Friday, Jan. 18, 2019. Colombia blames the National Liberation Army, ELN, rebels for the deadly attack that left more than 20 dead and wounded many others. (AP Photo/John Wilson Vizcaino)

A woman places flowers at an impromptu memorial outside the General Francisco de Paula Santander Police Academy, a day after a car bomb exploded at the site, in Bogota, Colombia, Friday, Jan. 18, 2019. Colombia blames National Liberation Army, ELN, rebels for the deadly attack that left more than 20 dead and wounded many others. (AP Photo/John Wilson Vizcaino)

An impromptu memorial sits outside the General Francisco de Paula Santander Police Academy, a day after a car bomb exploded at the site, in Bogota, Colombia, Friday, Jan. 18, 2019. Colombia blames the National Liberation Army, ELN, rebels for the deadly attack that left more than 20 dead and wounded many others. (AP Photo/John Wilson Vizcaino)

An impromptu memorial sits outside the General Francisco de Paula Santander Police Academy, a day after a car bomb exploded at the site, in Bogota, Colombia, Friday, Jan. 18, 2019. Colombia blames the National Liberation Army, ELN, rebels for the deadly attack that left more than 20 dead and wounded many others. (AP Photo/John Wilson Vizcaino)

A man places flowers at an impromptu memorial outside the General Francisco de Paula Santander Police Academy, a day after a car bomb exploded at the site, in Bogota, Colombia, Friday, Jan. 18, 2019. Colombia blames the National Liberation Army, ELN, rebels for the deadly attack that left more than 20 dead and wounded many others. (AP Photo/John Wilson Vizcaino)

A woman places flowers at an impromptu memorial outside the General Francisco de Paula Santander Police Academy, a day after a car bomb exploded at the site, in Bogota, Colombia, Friday, Jan. 18, 2019. Colombia blames the National Liberation Army, ELN, rebels for the deadly attack that left more than 20 dead and wounded many others. (AP Photo/John Wilson Vizcaino)

Police officers stand guard next to a firetruck at General Santander Police Academy in Bogota, a day after a car bomb attack killed 21 people and injured more than 80, on January 18, 2019. - Defense Minister Guillermo Botero described the Thursday bombing as "a terrorist attack committed by the ELN" and said he had "full evidence" that the bomber -- earlier identified as Jose Aldemar Rojas Rodriguez, 56 -- has been a member of the ELN for more than 25 years. (Photo by DANIEL MUNOZ / AFP)

Police officers stand at General Santander Police Academy in Bogota, a day after a car bomb attack killed 21 people and injured more than 80, on January 18, 2019. - Defense Minister Guillermo Botero described the Thursday bombing as "a terrorist attack committed by the ELN" and said he had "full evidence" that the bomber -- earlier identified as Jose Aldemar Rojas Rodriguez, 56 -- has been a member of the ELN for more than 25 years. (Photo by DANIEL MUNOZ / AFP)

Police officers stand at General Santander Police Academy in Bogota, a day after a car bomb attack killed 21 people and injured more than 80, on January 18, 2019. - Defense Minister Guillermo Botero described the Thursday bombing as "a terrorist attack committed by the ELN" and said he had "full evidence" that the bomber -- earlier identified as Jose Aldemar Rojas Rodriguez, 56 -- has been a member of the ELN for more than 25 years. (Photo by DANIEL MUNOZ / AFP)

Mounted police officers patrol outside General Santander Police Academy in Bogota, a day after a car bomb attack killed 21 people and injured more than 80, on January 18, 2019. - Defense Minister Guillermo Botero described the Thursday bombing as "a terrorist attack committed by the ELN" and said he had "full evidence" that the bomber -- earlier identified as Jose Aldemar Rojas Rodriguez, 56 -- has been a member of the ELN for more than 25 years. (Photo by DANIEL MUNOZ / AFP)

Mounted police officers patrol outside General Santander Police Academy in Bogota, a day after a car bomb attack killed 21 people and injured more than 80, on January 18, 2019. - Defense Minister Guillermo Botero described the Thursday bombing as "a terrorist attack committed by the ELN" and said he had "full evidence" that the bomber -- earlier identified as Jose Aldemar Rojas Rodriguez, 56 -- has been a member of the ELN for more than 25 years. (Photo by DANIEL MUNOZ / AFP)

Police officers stand guard at General Santander Police Academy in Bogota, a day after a car bomb attack killed 21 people and injured more than 80, on January 18, 2019. - Defense Minister Guillermo Botero described the Thursday bombing as "a terrorist attack committed by the ELN" and said he had "full evidence" that the bomber -- earlier identified as Jose Aldemar Rojas Rodriguez, 56 -- has been a member of the ELN for more than 25 years. (Photo by DANIEL MUNOZ / AFP)

Mounted police officers patrol outside General Santander Police Academy in Bogota, a day after a car bomb attack killed 21 people and injured more than 80, on January 18, 2019. - Defense Minister Guillermo Botero described the Thursday bombing as "a terrorist attack committed by the ELN" and said he had "full evidence" that the bomber -- earlier identified as Jose Aldemar Rojas Rodriguez, 56 -- has been a member of the ELN for more than 25 years. (Photo by DANIEL MUNOZ / AFP)

A woman lays flowers, in tribute to the victims of a car bomb attack that killed 21 people and injured more than 80, outside General Santander Police Academy in Bogota, on January 18, 2019. - Defense Minister Guillermo Botero described the Thursday bombing as "a terrorist attack committed by the ELN" and said he had "full evidence" that the bomber -- earlier identified as Jose Aldemar Rojas Rodriguez, 56 -- has been a member of the ELN for more than 25 years. (Photo by DANIEL MUNOZ / AFP)

A woman holds a newspaper with a headline reading "motherland pain" and the portraits of some of the 21 victims of a car bomb attack that took place the day before at General Santander Police Academy in Bogota, on January 18, 2019. - Defense Minister Guillermo Botero described the Thursday bombing as "a terrorist attack committed by the ELN" and said he had "full evidence" that the bomber -- earlier identified as Jose Aldemar Rojas Rodriguez, 56 -- has been a member of the ELN for more than 25 years. (Photo by DANIEL MUNOZ / AFP)

A woman lights a candle, in tribute to the victims of a car bomb attack that killed 21 people and injured more than 80, outside General Santander Police Academy in Bogota, on January 18, 2019. - Defense Minister Guillermo Botero described the Thursday bombing as "a terrorist attack committed by the ELN" and said he had "full evidence" that the bomber -- earlier identified as Jose Aldemar Rojas Rodriguez, 56 -- has been a member of the ELN for more than 25 years. (Photo by DANIEL MUNOZ / AFP)

Police cars and a firetruck are seen outside General Santander Police Academy in Bogota, a day after a car bomb attack killed 21 people and injured more than 80, on January 18, 2019. - Defense Minister Guillermo Botero described the Thursday bombing as "a terrorist attack committed by the ELN" and said he had "full evidence" that the bomber -- earlier identified as Jose Aldemar Rojas Rodriguez, 56 -- has been a member of the ELN for more than 25 years. (Photo by DANIEL MUNOZ / AFP)

Floral tributes left to the victims of a car bomb attack that killed 21 people and injured more than 80, lay outside General Santander Police Academy in Bogota, on January 18, 2019. - Defense Minister Guillermo Botero described the Thursday bombing as "a terrorist attack committed by the ELN" and said he had "full evidence" that the bomber -- earlier identified as Jose Aldemar Rojas Rodriguez, 56 -- has been a member of the ELN for more than 25 years. (Photo by DANIEL MUNOZ / AFP)