Dutch police and prosecutors are questioning two suspects as they investigate whether a deadly shooting on a tram in the central city of Utrecht was an act of terror.

Police spokesman Joost Lanshage said Wednesday that officers arrested a 40-year-old man in Utrecht on Tuesday and released two other men detained earlier. The alleged shooter, 37-year-old Gokmen Tanis, remains in custody.

A man opened fire on a tram on Monday, killing two men and a woman and seriously injuring three others.

37-year-old Gokmen Tanis is led away by police in Utrecht, Netherlands, Monday March 18, 2019, after a shooting incident on a tram. (Foto de Volkskrant via AP)  NETHERLANDS OUT NOT FOR USE IN THE NETHERLANDS
37-year-old Gokmen Tanis is led away by police in Utrecht, Netherlands, Monday March 18, 2019, after a shooting incident on a tram. (Foto de Volkskrant via AP) NETHERLANDS OUT NOT FOR USE IN THE NETHERLANDS

Prosecutors say they are seriously considering an extremist motive after finding a note in a suspected getaway car after the attack, and because of the nature of the shooting, but have not ruled out other possible motives.

Lanshage says, “we are looking into every lead there is.”

People lay flowers at a makeshift memorial site for the victims of a shooting incident in a tram in Utrecht, Netherlands, Tuesday, March 19, 2019. (AP Photo/Peter Dejong)
People lay flowers at a makeshift memorial site for the victims of a shooting incident in a tram in Utrecht, Netherlands, Tuesday, March 19, 2019. (AP Photo/Peter Dejong)
Women representing Utrecht's Muslim community lay a wreath at a makeshift memorial for the victims of a shooting incident in a tram in Utrecht, Netherlands, Tuesday, March 19, 2019. (AP Photo/Peter Dejong)
Women representing Utrecht’s Muslim community lay a wreath at a makeshift memorial for the victims of a shooting incident in a tram in Utrecht, Netherlands, Tuesday, March 19, 2019. (AP Photo/Peter Dejong)
Children lay flowers at a makeshift memorial site for the victims of a shooting incident in a tram in Utrecht, Netherlands, Tuesday, March 19, 2019. (AP Photo/Peter Dejong)
Children lay flowers at a makeshift memorial site for the victims of a shooting incident in a tram in Utrecht, Netherlands, Tuesday, March 19, 2019. (AP Photo/Peter Dejong)
Dutch Prime Minister Mark Rutte expresses his gratitude to Dutch police officers after laying flowers at a makeshift memorial for victims of a shooting incident in a tram in Utrecht, Netherlands, Tuesday, March 19, 2019. (AP Photo/Peter Dejong)
Dutch Prime Minister Mark Rutte expresses his gratitude to Dutch police officers after laying flowers at a makeshift memorial for victims of a shooting incident in a tram in Utrecht, Netherlands, Tuesday, March 19, 2019. (AP Photo/Peter Dejong)
Dutch Prime Minister Mark Rutte expresses his gratitude to Dutch police officers after laying flowers at a makeshift memorial for victims of a shooting incident in a tram in Utrecht, Netherlands, Tuesday, March 19, 2019. (AP Photo/Peter Dejong)
Dutch Prime Minister Mark Rutte expresses his gratitude to Dutch police officers after laying flowers at a makeshift memorial for victims of a shooting incident in a tram in Utrecht, Netherlands, Tuesday, March 19, 2019. (AP Photo/Peter Dejong)
Dutch Prime Minister Mark Rutte, right, and Justice Minister Ferd Grapperhaus arrive at a makeshift memorial for victims of a shooting incident in a tram in Utrecht, Netherlands, Tuesday, March 19, 2019. (AP Photo/Peter Dejong)
Dutch Prime Minister Mark Rutte, right, and Justice Minister Ferd Grapperhaus arrive at a makeshift memorial for victims of a shooting incident in a tram in Utrecht, Netherlands, Tuesday, March 19, 2019. (AP Photo/Peter Dejong)
Mourners pay heir respect at a makeshift memorial at the site of a shooting incident in a tram in Utrecht, Netherlands, Tuesday, March 19, 2019. (AP Photo/Peter Dejong)
Mourners pay heir respect at a makeshift memorial at the site of a shooting incident in a tram in Utrecht, Netherlands, Tuesday, March 19, 2019. (AP Photo/Peter Dejong)
The picture of one of the three victims sits amidst flowers as mourners pay their respect at the site of a shooting incident in a tram in Utrecht, Netherlands, Tuesday, March 19, 2019. (AP Photo/Peter Dejong)
The picture of one of the three victims sits amidst flowers as mourners pay their respect at the site of a shooting incident in a tram in Utrecht, Netherlands, Tuesday, March 19, 2019. (AP Photo/Peter Dejong)

Sign up to receive our latest news!

By submitting this form, I agree to the terms.