LONDON (Updated) -- Police specialists are collecting evidence in the heart of London after a series of attacks described as terrorism killed six people and injured more than 30 others on Saturday night, June 3.
Prime Minister Theresa May planned to chair an emergency security Cabinet session Sunday, June 4, to deal with the crisis.
The assault began when a van veered off the road and barreled into pedestrians on London Bridge. Witnesses say three men fled the van with large knives and attacked people at bars and restaurants in nearby Borough Market.
More than 30 victims are being treated at London hospitals and a number of others suffered less serious injuries.
The Metropolitan Police force declared the attacks "terrorist incidents." Assistant Commissioner Mark Rowley says while they believe all the attackers were killed, the investigation continues.
Police said armed officers were also responding to reports of stabbings nearby. The BBC reported that more than one person had been killed.
The Metropolitan Police said they were called just after 10 p.m. (2100GMT) to reports of a vehicle hitting pedestrians on the bridge, which crosses the River Thames in central London.
Soon after, there were reported stabbings at nearby Borough Market, an area full of bars and restaurants.
The force said armed officers were sent to the scenes and shots were fired. They did not say if officers fired the shots.
Police also said they were responding to another incident in the Vauxhall area, over a mile away.
The force tweeted a warning telling people in the area to run to safety, hide and then call police if it is safe to do so.
May said that "following updates from police and security officials, I can confirm that the terrible incident in London is being treated as a potential act of terrorism."
She said it was a fast-moving investigation and her thoughts were with "those who are caught up in these dreadful events."
About two hours after the first reports of an incident, television images showed people walking away from the London Bridge area with their hands on their heads. Police tweeted that Londoners should "remain calm but be alert and vigilant."