Police responded to two reports of firearms incidents in South-east London on Monday night.
They are working on the possibility of link between the incidents, which happened within an hour-and-a-half of each other and about five miles apart.
Officers were called at around 9.50pm to Brockley Rise, Lewisham to reports of an altercation involving a group of males, one of whom was firing a gun into the air.
Police responded and conducted an area search, but the suspects had left. There were no reports of any injuries, but several shell casings were recovered.
At 11.15pm the same night, officers were called to Dursley Road, Kidbrooke, about five miles away, to reports of a firearms discharge.
A teenage boy was injured by glass after shots were fired through a window.
He was treated at the scene by the London Ambulance Service for minor injuries. There were no other reported injuries.
There have been no arrests. Police are working to establish whether the two incidents are linked.
Anyone who has information that could help police should call 101 ref CAD 6627 or 7068 for December 12.
(Picture: The Met)