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.
He was subsequently arrested for a second time on suspicion of terrorism offences.
The attacker, who is believed to have acted alone, struck as the area was busy with worshippers attending Ramadan night prayers at the mosque.
Eight people were taken to hospital, with one since discharged, while two others were treated at the scene.
All of the casualties were Muslims.