The prime minister has said “it is time to say enough is enough” as she condemned a terror attack on “innocent and unarmed civilians” which left seven people dead and 48 injured in London.
A white van hit pedestrians on London Bridge at about 22:00 BST on Saturday, then three men got out and stabbed people in nearby Borough Market.
The three attackers, who wore fake bomb vests, were shot dead by police.
Mrs May said the UK’s counter-terrorism strategy would be reviewed.
It is the third terror attack in the UK in three months, following the car and knife attack in Westminster in March, which left five people dead, and the Manchester bombing less than two weeks ago, in which 22 people were killed.
Most political parties have suspended national general election campaigning, but Mrs May said full campaigning would resume on Monday and the general election would go ahead as planned on Thursday.