Detectives investigating a firearm discharge in Seven Kings have carried out a number of fast-time enquiries and now believe that the incident may have stemmed from an earlier incident in the street close to the mosque.
Officers will continue to work closely with representatives from the mosque and are providing reassurance to the local community.
Police were called at 10.45pm on Thursday, 9 May to reports that a man, believed to be in possession of a firearm, had entered a mosque on High Road in Seven Kings.
The man was ushered outside of the building by those inside. A gunshot was then heard.
Officers, including firearms officers, attended. There were no reported injuries and no damage to the building.
At this early stage, ballistic evidence recovered from the scene suggests that the weapon was a blank firing handgun.
Officers from Trident Specialist Crime investigate.
There have been no arrests and enquiries continue.
At this stage, the incident is not being treated as terrorism-related.
Anyone with information is asked to contact East Area Command on 101 quoting reference 8585/9May, Tweet @MetCC or call Crimestoppers anonymously on 0800 555 111.