Police shot a man as they arrested a group for allegedly holding a woman captive, Scotland Yard has said.
The man, believed to be in his 20s, was taken to hospital with a gunshot wound after an officer opened fire near Blackheath, south-east London, in the early hours of Saturday, police said.
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He was arrested along with a further six men. Five were detained on suspicion of false imprisonment and one for possession of an offensive weapon. Police were not immediately able to say why the wounded man was arrested.
The Independent Office for Police Conduct, the police watchdog, launched an investigation into the "non-fatal shooting".
Shortly before 4am, armed officers responded to a report of concern for the welfare of a woman in a property in Lewisham Road and a man being witnessed with a gun, the Metropolitan Police said.
An officer opened fire after police stopped a car near Lewisham Road's junction with Blackheath Hill, on the border of the borough of Greenwich.
The wounded man's injuries are not thought to be life-threatening.