'A number of casualties' reported after van collides with pedestrians outside London mosque

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Police are responding to reports of a van colliding with pedestrians outside a mosque in London, an incident that has resulted in "a number of casualties."

According to London's Metropolitan Police, one person has been arrested following the incident, which occurred shortly early Monday morning local time on Seven Sisters Road, near Finsbury Park station.

London Ambulance Service has devoted "a number of resources" to handling the incident.

The area was brimming with people as Muslim worshippers were departing from evening prayers, according to the BBC. The Muslim Council of Britain said its "prayers were with the victims." 

Witnesses at the scene have described the incident as "horrible" and "hell."

This story is developing. Sarah Kimmorley contributed to this report.