Officers were searching a residential address in the Cardiff area after the suspect injured 11 people in the attack on Muslims who had just left late-night prayers.
It is understood he had been living in Weston-super-Mare with his partner and children and had done the school drop-off on the same day of the attack, according to some reports.
A woman holds a sign reading “Leave our Muslim Neighbours Alone“, as she stands near the scene in Finsbury Park area of north London after a vehicle was driven into pedestrians, on Monday.
Shortly after midnight, the vehicle swerved into a group of people leaving prayers at the Muslim Welfare House and the nearby Finsbury Park Mosque in north London, one of the biggest in the country.
Locals eventually pinned down Osborne, and the imam of the Muslim Welfare House stepped in to stop him from receiving a mob beating. And witness Khalid Amin told the BBC that he heard him shout “kill all Muslims”.
“This was quite clearly an attack on Muslims who looked like they were probably Muslims and they were coming from a prayer meeting”, said the Met police commissioner, Cressida Dick.
“Muslim communities have been calling for increased action to tackle the growth in hate crime for many years and transformative action must now be taken to tackle not only this incident but the hugely worrying growth in Islamophobia“.
Britain’s terror alert level is at “severe”, meaning security officials believe an attack is highly likely.
In a statement at 4.46am they said the incident was being investigated by counter-terrorism police. “All of a sudden we heard him say, ‘Inbred.’ I said to my nan: ‘Did you hear that?’ She said it was probably to his dogs”.
Police said the arrested man would be the “subject of a mental health assessment in due course”.
Several bunches of flowers had been deposited outside the mosque as commuters went to work on Monday morning.
London Mayor Sadiq Khan said that there has been a 40% surge in Islamophobic incidents following attacks in London and Manchester during the electoral campaign.
An aerial view of where the incident occurred in Finsbury Park.