The family of a man arrested after a terror attack near a London mosque – later identified as 47-year-old Darren Osborne – say they are “shocked” and “devastated”.
The father of father-of-four was held on suspicion of attempted murder and alleged terror offences after a van hit Muslims in Finsbury Park.
They had been helping a man who had collapsed. He later died but it is not clear if it was because of the attack.
Met Police chief Cressida Dick and faith leaders were among hundreds who took part in a vigil on Monday night.
Ms Dick said the incident was “quite clearly an attack on Muslims”, and the community would now see more police, including armed officers, in the area, “particularly around religious establishments”.
Mr Osborne’s mother, sister and nephew said in a statement: “We are massively in shock, it’s unbelievable. It still hasn’t really sunk in.”
They added that their “hearts go out to those who’ve been injured”.
Police have carried out searches at an address in the Cardiff area.
Security Minister Ben Wallace said the suspect was not known to the security services, and was believed to have acted alone.
The BBC understands Mr Osborne grew up in Weston-super-Mare, Somerset, and has lived at more than one property in Cardiff. He is also believed to have lived in Swindon.
The Metropolitan Police said he was being held on suspicion of the commission, preparation or instigation of terrorism including murder and attempted murder.
The attack took place shortly after midnight close to Muslim Welfare House on Seven Sisters Road, which is also a community centre.
Police say 11 other people were injured – including nine taken to hospital and two treated at the scene.
Several of the injured are believed to be seriously hurt.