SL Security Centre
Call the Security Centre toll free 020 120 25 25 (from Swedish phone numbers and SIM cards only) if you wish to report threats, violence or vandalism. The Security Centre is open 24 hours.
The Security Centre organises guards and other supervisors of SL’s services. They also run the surveillance cameras in the Metro stations.
If the situation is particularly threatening or dangerous, you should of course contact the police in the first instance. The Emergency number in Sweden is 112.