London Bridge has been closed off by police, with a Report Focus journalist reporting hearing gunfire.
Report Focus News reporter Mickel Jogns said he saw a group of men involved in a fight on the bridge.
Police then arrived and shots were fired, he said.
The Met Police confirmed that it was dealing with an incident at London Bridge.
Pictures on social media showed several police cars on the bridge, with a lorry stopped across the central reservation of the dual carriageway bridge.
London Ambulance Service have tweeted they are on the scene.
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