Iran Press/Europe: A person is believed to have started attacking people with a knife and was then, according to witnesses, shot by police.
There are up to five casualties, police told Sky News.
A Metropolitan Police spokesman said: "Police was called at 1.58 pm to a stabbing at premises near to London Bridge. Emergency services attended, including officers from the Met and City of London Police.
He continued to say: "A man has been detained by police. It is believed a number of people have been injured."
Video from the London bridge incident appears to show one armed police officer at the beginning of the northside of the bridge crouched behind a police car aiming a gun down the bridge.
The video then moves to an unresponsive person on the pavement on the east side of the bridge.
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