It's understood a man armed with a knife has attacked people on London Bridge.
Police have confirmed they were called to reports of a stabbing just before 2 o'clock.
All we know at the minute is a number of people have been injured.
Earlier it was being reported a man had been shot dead by officers – but all the Metropolitan force is saying now is that a man has been detained.
The London Ambulance Service has declared a major incident.
British Transport Police say London Bridge station has been closed.