A number of people have been stabbed and a man has been shot dead by police in an attack at London Bridge.
The Met Police has declared the stabbing attack a terrorist incident.
The suspect, who died at the scene, was believed to have been wearing a hoax explosive device, police said.
A BBC reporter at the scene said he had seen a fight on the bridge, with several men attacking one man. Police then arrived quickly and a number of shots were fired at him, he said.
Details are still emerging and Neil Basu, the head of UK counter-terrorism policing, said the force was keeping an open mind over the motive.
He said officers were called to a stabbing at a premises near the bridge just before 14:00.
Footage has emerged on social media of a man apparently being pinned down by members of the public.
Another man in a suit and jacket could be seen running from him, having apparently retrieved a large knife.
The members of the public then disperse and the man appears to be shot by police as he lay on the ground.
Mr Basu told a press conference: "A male suspect was shot by specialist armed officers from City of London police and I can confirm that this suspect died at the scene."
British Transport Police said London Bridge station was currently closed and no trains would be stopping there.