British counterterrorism police said Sunday they had arrested 12 people in Barking, in east London, in connection with the van and knife attack at London Bridge that left seven people dead a day earlier.
“Searches of a number of addresses in Barking are continuing,” they said in a statement.
Footage from Sky News and social media showed a police cordon around an apartment building in Barking, an east London suburb.
Local residents said one of the suspects attempted to flee, and was shot by arresting officers.
British authorities have said officers shot dead all three attackers in Saturday night’s terror attack, but that the investigation was continuing.
At least seven people were killed Saturday night after a van veered off the road and barreled into pedestrians on busy London Bridge. Three men fled the van with large knives and attacked people at bars and restaurants in nearby Borough Market, police and witnesses said.
— Sky News (@SkyNews) June 4, 2017
The attack unfolded quickly, and police said officers had shot and killed the three attackers within eight minutes.
Emergency officials said 48 people were treated at London hospitals and a number of others suffered less serious injuries.
Britain was already on edge after a suicide bombing two weeks ago at an Ariana Grande concert in Manchester, in northwest England, that killed 22 people and injured dozens of others. Grande and other stars are scheduled to perform a benefit concert for victims Sunday night.
The Islamic State group claimed responsibility for the Manchester bombing, but there has not yet been a claim of responsibility for Saturday’s attack.