The main suspect in a deadly tram shooting in the Dutch city of Utrecht will be charged with offences including multiple murder or manslaughter with a terrorist intent, prosecutors said.

Investigations so far into Monday’s shooting that left three dead and three seriously injured indicate that the shooter acted alone, prosecutors said in a written statement.

The main suspect, identified by police as Gokmen Tanis, a 37-year-old man of Turkish descent, also faces charges of attempted murder or manslaughter and making threats with a terrorist intent.

The prosecution office statement adds that investigations are continuing into whether the suspect’s actions “flowed from personal problems combined with a radicalised ideology”.

Construction workers who witnessed Monday’s shooting incident in a tram put flowers at the site in Utrecht
Construction workers who witnessed Monday’s shooting incident put flowers at the site in Utrecht (Peter Dejong/AP)

Tanis is to appear before an investigating judge on Friday.

Such hearings are held behind closed doors.

A 40-year-old man detained on Tuesday afternoon is still under investigation to establish “if he possibly had a supporting role, outside the shooting incident”, prosecutors said.

Two men and a woman were killed when a shooter opened fire on a tram in Utrecht.

Authorities put the Netherlands’ fourth largest city in lockdown for hours amid fears that more than one shooter was active at different locations.

Dutch counter-terrorism police after a shooting in Utrecht
Dutch counter-terrorism police after the shooting (Peter Dejong/AP)

It was dropped to four once the suspect was detained.

Prosecutors have said they were focused on a possible terrorist motive because of the nature of the shooting – they say none of the victims was known to the alleged shooter – and because of a note found in a getaway car.

They have not disclosed what was written in the note.

A silent march is planned for Friday evening in Utrecht to commemorate the victims.