It is reported by TV channel DR.
According to him, the suspect in the murder of three people will be placed in a closed psychiatric hospital.
According to the arrest warrant, there is a risk that he could commit more crimes if he is released.
Earlier, Copenhagen police announced three people were killed in a shooting at a shopping center.
The suspect, a 22-year-old Danish citizen, was detained.
The police did not rule out the terrorist nature of the shooting.