Police said the man was shot and killed early Monday morning in Romford in east London.
Police say they responded to a call at 3:50 a.m. reporting a man making threats and claiming to have a weapon. He was shot at 4:45 a.m.
Forensics teams were collecting evidence at the gas station where it happened. There will be a mandatory investigation by the Independent Office for Police Conduct.
The shooting came as London is experiencing a spike in knife-related crime.
The identity of the man who died has not been released.
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