LONDON — Dutch prosecutors said on Thursday that they planned to bring terrorism charges against a man suspected of killing three people on a tram in the city of Utrecht, in addition to multiple counts of murder or manslaughter.

In a statement, the public prosecutor’s office in the Netherlands suggested that the mental health of the suspect, Gokmen Tanis, was also under investigation, as well as his motives.

“It’s being investigated if the suspect acted out of solely terrorist motive or that his actions came from personal problems in combination with radicalized ideology,” prosecutors said. “The Dutch Institute for Forensic Psychiatry and Psychology will be asked to conduct an investigation of the suspect’s personality.”

Mr. Tanis, 37, is scheduled to be arraigned on Friday in his first court appearance in connection with the shootings in Utrecht.