A police watchdog is investigating the circumstances of a series of incidents in Edinburgh last month during which armed officers searched a house.
They also later detained five people at a different location.
The incidents took place in the early hours of 22 July.
The Police Investigations & Review Commissioner (Pirc) said Police Scotland referred the matter to them as armed officers had "presented firearms" during the incidents.
Pirc's findings will be submitted to the chief constable at a later date.