LONDON — A vehicle drove into pedestrians early Monday in London.

The Metropolitan Police called it “a major incident” and said that a number of casualties are being treated at the scene.

One person has been arrested.

The incident occurred on Seven Sisters Road in Finsbury Park, a neighborhood where many immigrants live.

Unconfirmed reports on social media suggested that the pedestrians might have been leaving the Finsbury Park Mosque, a major Islamic house of worship.

Mohammed Kozbar, chairman of the Finsbury Park Mosque, said in a Twitter post that “our thoughts and prayers with those who got injured and effected by this cowardly attack in Finsbury Park area” and said there were “many casualties in the floor.”

The arrest revived anxieties in the British capital, which has endured two recent attacks involving vehicles.

On March 22, a 52-year-old Briton rammed a car into a crowd of pedestrians on Westminster Bridge, fatally injuring four of them, and then stabbed a police officer to death before he was gunned down by police.

On June 3, three men drove a van into pedestrians on London Bridge, before launching a knife attack in nearby Borough Market. Eight people were killed before the men were shot to death by police.