LONDON — The rash of deadly terror attacks that has rattled Britain in recent months took an ominous new turn on Monday as Muslim worshippers became targets during the holy month of Ramadan, mowed down by an attacker who plowed a van into a crowd leaving prayers at two mosques in north London.

It was the same tactic Islamic extremists used in recent assaults on Westminster Bridge and London Bridge. Those attacks and a third outside a pop concert in Manchester have triggered a surge in hate crimes against Muslims around Britain.

British authorities, including Prime Minister Theresa May, and Islamic leaders moved swiftly to ease concerns in the Muslim community following the attack shortly after midnight that injured at least nine people in London’s Finsbury Park neighborhood, which is home to a large Muslim population.

Authorities said the incident was being treated as a terror attack. One man died at the scene, although he was receiving first aid at the time and it wasn’t clear if he died as a result of the attack or from something else.

British media identified the suspect as Darren Osborne, a 47-year-old Briton and father of four living in Cardiff, Wales, who was not known to authorities before the attack.