Danish police said Monday that the suspect in a weekend shooting at a Copenhagen mall in which three people were killed is "known among psychiatric services" and that the attack was not an act of terror.

"Our suspect is also known among psychiatric services, beyond that I do not wish to comment," the Danish capital's police chief Søren Thomassen said in a press conference Monday morning.

Several people were also wounded in the attack, four of which are in critical condition, Thomassen said, adding that the 22-year-old Danish suspect taken into custody most likely acted alone.