An explosion damaged the entrance of an apartment building in Hässelby, northwestern Stockholm, shortly after midnight on Wednesday, triggering a large-scale police response. Emergency services were alerted just after midnight, and a blast shattered a glass window in the building's front door, though no injuries were reported.
Police have opened an investigation into aggravated unlawful threats and violations of flammable and explosive goods laws, having revised the initial classification from criminal damage causing public danger. No suspects have been arrested in connection with the incident.
Officers deployed dog units and a helicopter to search the surrounding area for those responsible. The explosion occurred in a residential district of the Swedish capital.