Shots were fired at a door in a multi-family building in Östermalm, Stockholm, Swedish police said. Police said it is unclear whether anyone was home at the time. No one was injured, they added. Officers were alerted at around 8pm on Friday after reports of a bang in the area. When they arrived, they found what they assessed was a bullet hole in an apartment door. A police operation is now under way at the address. Officers are searching for the person responsible and checking whether any camera footage is available. Witnesses are also being interviewed as part of the investigation. The investigation is still ongoing, with police continuing the search for the suspect.