More than one person has died after an incident involving a vehicle and stabbings in the London Bridge area of the capital, police have said.
Armed police responded to reports of a van hitting pedestrians on the bridge in central London.
The Met Police said officers were also at Borough Market nearby where they were responding to reports of stabbings.
The force said they were also attending a reported incident in Vauxhall.
Downing Street said Prime Minister Theresa May, who has been campaigning in the general election, was returning to Downing Street to receive further briefings from security officials.
Transport for London said London bridge has been closed in both directions due to a “major police incident”.