The man suspected of carrying out the Finsbury Park mosque attack has been named locally as 47-year-old Darren Osborne.
The father-of-four from Cardiff was arrested for attempted murder at the scene and taken to a south London police station where he remains in custody, the Independent reported.
A statement from the Metropolitan Police said he was subsequently arrested for a second time on suspicion of terrorism offences.
Osborne is reported to have been living in Weston-super-Mare with his partner and children
The attacker, who is believed to have acted alone, struck as the area was busy with worshippers attending Ramadan night prayers in north London.
At least eight people were taken to hospital, with one since discharged, while two others were treated at the scene after the attack early on Monday morning.
All of the casualties were Muslims.