Metropolitan police are responding to an incident in the Vauxhall area, along with two ongoing major incidents in Borough Market and London Bridge.
There is little information on the Vauxhall incident but there are reports that there has been at least one fatality from the London Bridge incident. It's understood that a van mounted the curb and ploughed into a group of pedestrians.
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BBC reporter Holly Jones was on the bridge when the incident unfolded: "He swerved right round me and then hit about five or six people. He hit about two people in front of me and then three behind."
Another person has told the Telegraph: "We were in London Bridge station. An announcement came on which said that due to an emergency the station was closing and to leave via the nearest exit.
"There was a woman and her husband crying. They said a van had mowed people down on London Bridge and were stabbing and shooting people. They were both very upset."
Credit: PA
Credit: PA
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The other ongoing incident is taking place in Borough Market. Bars in the area have allegedly been locked down, with armed officers telling people inside to find safety.
Will Orton has told the BBC: "Lots of people came running inside, we didn't really know what was going on. We thought maybe there was a fight or something outside. And then there were almost hundreds of people coming inside. The bouncers did a really good job, they shut the doors and locked everyone in."
A Downing Street spokesman said: "The prime minister is in contact with officials and is being regularly updated on the incident at London Bridge."
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Topics: London