Seven people were killed in central London when three attackers drove a van into pedestrians on London Bridge and launched a knife attack in Borough Market.
Police have declared it a terrorist incident. Here is what we know so far.
What happened?
Police said that the attack began at 21:58 BST on Saturday when a van drove onto London Bridge from the north side.
It mounted the pavement and hit several people, before crashing near the Barrowboy and Banker pub, at the southern end of the bridge.
The suspects got out, armed with knives, and ran the short distance to Borough Market where they stabbed several people.
Armed police and ambulances were called at 22:08 BST.
Eyewitnesses spoke of attackers targeting people in pubs and restaurants. Some people tried to fight them off by throwing chairs and glasses.
As the area was cordoned off, police shouted at members of the public to run or hide.
