A suspect, named locally as Darren Osborne of Cardiff, is pictured being arrested at the scene of the terror attack in Finsbury Park.
The BBC was among other media which identified the man arrested as Osborne, while London’s Metropolitan Police said it would not name the suspect until he was charged.
Osborne’s neighbor, 52-year-old Dave Ashford, told the Guardian he was shocked to discover that Osborne was suspected of being behind the attack.
On Monday, police said that all of the victims outside the mosque were from the Muslim community, but it was “too early to tell” if the man who died at the scene did so as a result of the attack.
Police officers stand guard outside a residential property in Cardiff, south Wales as investigations continue into the attack.
Nine people were hospitalised after a white driver, who witnesses said shouted: “I want to kill all Muslims”, slammed into a crowd near a mosque in the Finsbury Park area of London.
Met Police Commissioner Cressida Dick said the incident was “quite clearly an attack on Muslims”, and there would be more police, including armed officers, in the area, “particularly around religious establishments”.
Police said eight people had been taken to three separate hospitals and two people were treated at the scene for minor injuries.
He was arrested, initially for attempted murder and later on terror grounds, police said on Monday. “Sadly, he has died”. He then said that he struck the attacker and helped to subdue him, pinning him down until the police arrived.
Police are treating the incident as a terrorist attack.
She has faced heavy criticism for her response to a fire in a London tower block on Wednesday which killed at least 58 people, and for her record on security after a series of attacks blamed on Islamist militants in recent months.
“It is a reminder that terrorism, extremism and hatred take many forms and our determination to tackle them must be the same, whoever is responsible”, she said.
The crash occurred at a time when the multiethnic neighborhood was crowded with Muslims leaving the Finsbury Park mosque after Ramadan prayers.
It was the third major incident in the capital in weeks, after the London Bridge attack and last week’s devastating Grenfell Tower fire.