Armed police are dealing with another incident in Borough Market, London. Emergency services are also responding to London Bridge after reports of a white van mounting the curb and ploughing into pedestrians.
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."
More to come.
Source: BBCFeatured Image Credit: PA/Twitter