Danish police said Monday that the 22-year-old suspect in a weekend shooting at a Copenhagen mall that left three dead and four injured was known to mental health services.

"Our suspect is also known among psychiatric services, beyond that I do not wish to comment," Copenhagen police chief Soren Thomassen told a press conference.

He also said that the victims appeared to have been randomly targeted in the attack on Sunday evening and there was nothing to indicate it was an act of terror.

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At least 3 killed in Copenhagen shopping mall shooting

In the press conference on Monday morning, police said the victims were two Danish 17-year-olds, one male and one female, and a 47-year old Russian citizen residing in Denmark. Two Danes and two Swedes are in critical condition in hospital.

The suspect, who has not been identified and was arrested minutes after the shooting, will face questioning by a judge on Monday.

(With input from AFP)