British counter-terrorism 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.
“Searches of a number of addresses in Barking are continuing,” they said in a statement.
A woman was also arrested but was released following the raid by armed officers at 7:00 am (0600 GMT) in Barking, east London, the broadcaster said.
Terror struck at the heart of London on Saturday night as attackers killed seven people in a series of vehicle and knife attacks before police shot them dead.
The assault began when a van veered off the road and barreled into pedestrians on 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. More than 30 victims were treated at London hospitals and a number of other patients were treated for less serious injuries.
The violence turned a summery night in an area packed with revelers into a scene of panic and chaos, with officers running through crowded streets screaming for people to flee. Lifeboats on the River Thames helped evacuate the area.
The Metropolitan Police force declared the attacks “terrorist incidents.” Assistant Commissioner Mark Rowley said that while they believe all the attackers were killed, the investigation continued.
However, on Sunday, London’s Metropolitan Police would not confirm the arrests or the raid, although an AFP reporter at the scene said there were several police vehicles outside a block of flats that had been cordoned off.
Metropolitan Police Commissioner Cressida Dick earlier told reporters: “We believe the threat that they posed was neutralised.
“Of course it’s a very complex and confused scene, and a confused series of events.
“So it’s important that we first of all make sure there is no one else outstanding. We don’t believe there is, but we must make absolutely certain of that.
“We have a very large investigation ongoing, and we will be seeking to establish whether anyone else was working with or assisting in any way or helping in the planning of this attack.”