Police have named two of the London Bridge attackers, who drove a van into pedestrians and stabbed bystanders before being shot dead by police.Their names were given as Khuram Butt and Rachid Redouane.
They said Butt, who was 27, was a Pakistan-born British national known to MI5.
Redouane, a 30-year-old who police said was claimed to be of Moroccan and Libyan descent, was not known to British authorities however.
They said he also went by the identity Rachid Elkhdar.
Police said there was no evidence the attack had been planned.
They said inquiries into the identity of the third attacker were ongoing.
The three attackers were shot dead by police after driving into pedestrians on London Bridge and stabbing people in Borough Market.
The attack left seven people dead, as well as the attackers, and 48 injured. NHS England said 36 people remained in hospital, with 18 in a critical condition.