Police in the UK has arrested 12 people in relation to the London attack which killed 7 people and injured 48 others.
Arrests were made during a raid on a flat in Barking, East London, on Sunday.
The flat is said to be owned by one of the three attackers.
Local media reports say that one of the attackers who lived in Barking was married and had two children.
Three men, believed to be the attackers, were shot by police at Borough Market.
None of the seven dead people in the attack have been officially named.
Meanwhile, security has been tightened at the venue of a solidarity music concert hosted by Ariana Grande in Manchester on Sunday.
The concert aims to show support for victims of the Manchester Arena attack and serves as a tribute to the victims killed in the attack.
Many artists would be performing at the concert.
Ariana Grande’s manager Scooter Braun tweeted that the “One Love Manchester” concert will go ahead with greater purpose adding organisers and participants were not cowed by the events in London.
“All artists involved have been unwavering in their support this morning and are determined to carry on with the show”, he said.
Greater Manchester Police said extra effort has been made to ensure the event was crisis free.
Assistant Chief Constable Garry Shewan said “There will be additional security checks taking place and everyone will be searched, including bags. We would ask people not to bring bags if they can, as this will help speed up entry.”