The Hague, The Netherlands, March 19 2019 - The flags of the government buildings all over the country are hanging half-mast today, a day after the shooting in Utrecht. Police are reporting today that the investigation so far has not shown any relationship between the main suspect of the shooting and the victims. The three people who were killed were a 19 year old woman, and two man of 28 and 49 years old. Photo: Laurens van Putten / Hollandse Hoogte

Baarn, The Netherlands, March 19 2019 - The flag of the city hall of Baarn is hanging half-mast today, a day after the shooting in Utrecht. Police are reporting today that the investigation so far has not shown any relationship between the main suspect of the shooting and the victims. The three people who were killed were a 19 year old woman, and two man of 28 and 49 years old. Photo: Caspar Huurdeman / Hollandse Hoogte

The Hague, The Netherlands, March 19 2019 - The flags of the government buildings all over the country are hanging half-mast today, a day after the shooting in Utrecht. Police are reporting today that the investigation so far has not shown any relationship between the main suspect of the shooting and the victims. The three people who were killed were a 19 year old woman, and two man of 28 and 49 years old. Photo: Laurens van Putten / Hollandse Hoogte

The Hague, The Netherlands, March 19 2019 - The flags of the government buildings all over the country are hanging half-mast today, a day after the shooting in Utrecht. Police are reporting today that the investigation so far has not shown any relationship between the main suspect of the shooting and the victims. The three people who were killed were a 19 year old woman, and two man of 28 and 49 years old. Photo: Laurens van Putten / Hollandse Hoogte

Utrecht, The Netherlands, March 19 2019 - People are laying flowers on the 24 Oktoberplein in Utrecht, the day after the shooting. The trams are driving according to the timetables again today. Flowers have been placed at the stop near to the incident. Police are reporting today that the investigation so far has not shown any relationship between the main suspect of the shooting and the victims. The three people who were killed were a 19 year old woman, and two man of 28 and 49 years old. Photo: Arie Kievit / Hollandse Hoogte

Utrecht, The Netherlands, March 19 2019 - People are laying flowers on the 24 Oktoberplein in Utrecht, the day after the shooting. The trams are driving according to the timetables again today. Flowers have been placed at the stop near to the incident. Police are reporting today that the investigation so far has not shown any relationship between the main suspect of the shooting and the victims. The three people who were killed were a 19 year old woman, and two man of 28 and 49 years old. Photo: Arie Kievit / Hollandse Hoogte

Utrecht, The Netherlands, March 19 2019 - The flag of the Rijksuniversiteit Utrecht (National University Utrecht) is hanging half-mast today, a day after the shooting in Utrecht. The unversity buildings were temporarily closed. Police are reporting today that the investigation so far has not shown any relationship between the main suspect of the shooting and the victims. The three people who were killed were a 19 year old woman, and two man of 28 and 49 years old. Photo: Gerard Til / Hollandse Hoogte

Several people got injured today when one man started shooting on the tram, the gunman is now arrested. Three people were killed, five people were injured. Police say it is not sure there was a 'terrorist motive'. Some witnesses say there were multiple shooters. Pictured are special units of the police. Photo: Arie Kievit / Hollandse Hoogte

Several people got injured today when one man started shooting on the tram, the gunman is now arrested. Three people were killed, five people were injured. Police say it is not sure there was a 'terrorist motive'. Some witnesses say there were multiple shooters. Pictured are special units of the police. Photo: Arie Kievit / Hollandse Hoogte

Several people got injured today when one man started shooting on the tram, the gunman is now arrested. Three people were killed, five people were injured. Police say it is not sure there was a 'terrorist motive'. Some witnesses say there were multiple shooters. Pictured are special units of the police. Photo: Arie Kievit / Hollandse Hoogte

Rotterdam, The Netherlands, March 18 2019- In Rotterdam, the Turkish Mevlana mosque is guarded by police officers. This is due to the attack in Utrecht, Monday. The officers are talking with a trainer of the Turkish Sports Association United, behind the mosque. Photo: Hans van Rhoon / Hollandse Hoogte

Several people got injured today when one man started shooting on the tram, the gunman is now arrested. Three people were killed, five people were injured. Police say it is not sure there was a 'terrorist motive'. Some witnesses say there were multiple shooters. Pictured are special units of the police. Photo: Arie Kievit / Hollandse Hoogte

Several people got injured today when one man started shooting on the tram, the gunman is now arrested. Three people were killed, five people were injured. Police say it is not sure there was a 'terrorist motive'. Some witnesses say there were multiple shooters. Pictured are special units of the police. Photo: Arie Kievit / Hollandse Hoogte

Rotterdam, The Netherlands, March 18 2019- In Rotterdam, the Turkish Mevlana mosque is guarded by police officers. This is due to the attack in Utrecht, Monday. Photo: Hans van Rhoon / Hollandse Hoogte

18.03.2019 , Nach dem Terrorakt in Utrecht (Niederlande) wird der Tatverdachtige G?KMEN TANIS am fruhen Abend von Spezieleinheiten der niederlandischen Polizei in der Stra?e OUDENOORD 140-152 festgenommen. SMARTPHONE PHOTO / HANDOUT / NEIGHBOUR *** 18 03 2019 After the terrorist act in Utrecht Netherlands the suspect G?KMEN TANIS is arrested in the early evening by special units of the Dutch police in the street OUDENOORD 140 152 SMARTPHONE PHOTO HANDOUT NEIGHBOUR

18.03.2019 , Nach dem Terrorakt in Utrecht (Niederlande) wird der Tatverdachtige G?KMEN TANIS am fruhen Abend von Spezieleinheiten der niederlandischen Polizei in der Stra?e OUDENOORD 140-152 festgenommen. SMARTPHONE PHOTO / HANDOUT / NEIGHBOUR *** 18 03 2019 After the terrorist act in Utrecht Netherlands the suspect G?KMEN TANIS is arrested in the early evening by special units of the Dutch police in the street OUDENOORD 140 152 SMARTPHONE PHOTO HANDOUT NEIGHBOUR