A man was stabbed to death yards from his front door in an attack by a mob of up to 40 youths on bicycles.
Jason Gayle-Bent was stabbed in the heart
Jason Gayle-Bent, 29, was sitting on a wall with two friends when the gang rode up in Ludwick Mews in south-east London on Sunday, police said.
One of the youths pulled out a gun, aimed and fired several shots before the group dispersed.
Police believe the same gang may also have attacked and wounded another man shortly afterwards in Deptford Wharf.
Straight after the attack on Mr Gayle-Bent, the gang is thought to have fired shots in the air outside the Community Action Centre in Grove Street.
Police believe they then chased a man who fled the centre on a moped. In his bid to escape the gang, he crashed his bike and then tried to run off.
The youths caught up with him at a doorway of an address in Deptford Wharf, where he was assaulted and stabbed.
A firearm was also discharged at the scene. The victim was treated in hospital and has since been allowed home.
Police are investigating whether the two attacks were linked and are keeping an open mind as to the motive.