Follow up reports also told of authorities London bridge in lock down with the surrounding area closed with bus routes being diverted, as armed police and a bomb squad attend the scene and boats search the Thames for bodies - amid reports that people were pushed into the water.
Officers were seen dragging startled diners and revellers out of restaurants and bars and telling them to run.
On Saturday evening police responded to the scene at London Bridge after a vehicle plowed into pedestrians. The possible attacker was shown on the ground outside the Wheatsheaf pub in Borough Market near London Bridge.
British Transport Police has asked people to avoid the area as it deals with the situation.
The incidents come nine days after a suicide bomber with apparent ties to terror groups killed 22 people and injured scores of others outside an Ariana Grande concert in Manchester, England.
One witness wrote on Twitter: "Passerby says 15-20 people have been run over". In March, four people were killed in London after Khalid Masood rammed his auto into pedestrians on Westminster Bridge before fatally stabbing a policeman outside the Houses of Parliament.
Labor senator Sam Dastyari said on social media he was having dinner near the bridge and was evacuated past the scene by police after they placed the restaurant in lockdown.
Another witness, Will Heaven, said he saw people who appeared to have been hit, and one being put into an ambulance.
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