Dutch police say they have arrested a third person on suspicion of involvement in the tram shooting in the city of Utrecht that left three people dead and five injured.

Public prosecution office spokesman Ties Kortmann said Tuesday that three people are now in custody — the alleged shooter, 37-year-old Gokmen Tanis and two others who were also arrested on suspicion of involvement in the shooting Monday morning.

Kortmann says Tanis is being held on suspicion of manslaughter with a possible terrorist motive, but adds that investigations are continuing into what drove him to allegedly open fire in a tram.

Ambulances are parked next to a tram after a shooting incident in Utrecht, Netherlands, Monday, March 18, 2019. (AP Photo/Peter Dejong)
Ambulances are parked next to a tram after a shooting incident in Utrecht, Netherlands, Monday, March 18, 2019. (AP Photo/Peter Dejong)

Authorities say they have not ruled out other possible motives and Dutch media citing his neighbors in Utrecht have speculated that the shooting may have been linked to a relationship.

Dutch counter terrorism police prepare to enter a house after a shooting incident in Utrecht, Netherlands, Monday, March 18, 2019. (AP Photo/Peter Dejong)
Dutch counter terrorism police prepare to enter a house after a shooting incident in Utrecht, Netherlands, Monday, March 18, 2019. (AP Photo/Peter Dejong)
The body of one of three victims is covered with a white sheet as it lies next to a tram after a shooting incident in Utrecht, Netherlands, Monday, March 18, 2019. (AP Photo/Peter Dejong)
The body of one of three victims is covered with a white sheet as it lies next to a tram after a shooting incident in Utrecht, Netherlands, Monday, March 18, 2019. (AP Photo/Peter Dejong)
Dutch police stand guard outside a house where the suspect of a shooting incident in a tram was arrested in Utrecht, Netherlands, Monday, March 18, 2019. (AP Photo/Peter Dejong)
Dutch police stand guard outside a house where the suspect of a shooting incident in a tram was arrested in Utrecht, Netherlands, Monday, March 18, 2019. (AP Photo/Peter Dejong)
A forensic expert looks for clues in a house where the suspect of a shooting incident was arrested in Utrecht, Netherlands, Monday, March 18, 2019. (AP Photo/Peter Dejong)
A forensic expert looks for clues in a house where the suspect of a shooting incident was arrested in Utrecht, Netherlands, Monday, March 18, 2019. (AP Photo/Peter Dejong)

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