A van slammed into a crowd of people on a road in north London around midnight Sunday night leaving several people hurt, police said, adding that one person has been arrested.

The crash immediately raised concerns of another terrorist attack in London; however, police did not reveal the possible cause.

Our thoughts and prayers with those who got injured and effected by this cowardly attack in Finsbury Park area, many casualties in the floor

— Mohammed Kozbar (@KozbarM) June 19, 2017

It happened as worshipers were leaving the Finsbury Park Mosque after midnight Ramadan prayers, Sky News reported. Paramedics rushed at least one person away in an ambulance, Reuters added.

The crash immediately raised concerns of another terrorist attack in London; however, police did not reveal the possible cause.

"I could see at least two people on the floor, not moving," witness Cynthia Vanzella, who said the nearby crash woke her up, told Sky News. "There were people sitting on the floor with their head in their hands."

Officers were called to the scene of the "major incident" on Seven Sisters Road at 12:20 a.m. Monday, Metropolitan Police said. The London Ambulance Service said it was responding to the incident.

Earlier this month, a van veered into pedestrians on London Bridge, setting off vehicle and knife attacks that killed eight people and wounded many others on the bridge and in the nearby Borough Market area. Three Muslim extremists who carried out the attack were killed by police.

In March, Khalid Masood, a British citizen, crashed his car at Westminster Bridge before launching a stabbing attack on the grounds of Parliament, killing five people in all. Police shot and killed him, ending the massacre.

Britain’s terrorist alert has been set at "severe" meaning an attack is highly likely.

The Finsbury Park Mosque is about a 20-minute drive north of London Bridge.

The Associated Press contributed to this report.