A number of people are believed to have been injured in an incident at London Bridge, police have said.
The Met said they were called to a stabbing at a premises near the bridge just before 14:00.
The force said they had detained a man. London Ambulance Service has declared a “major incident”.
The BBC’s John McManus, at the scene, said he had seen a group of men in a fight on the bridge. Police then arrived and shots were fired, he said.
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