A van ploughed into worshippers leaving a London mosque on Monday, killing at least one person and injuring 10 others, Reuters reported. The incident was being treated as a potential terrorist attack said Prime Minister Theresa May. Shortly after midnight, the hired vehicle swerved into a group of people leaving prayers at the Finsbury Park Mosque, one of the biggest in the country, witnesses said. Police said one man was pronounced dead at the scene and the van driver, aged 48, had been detained by members of the public before being arrested. The driver would undergo a mental health assessment, police said. Eight people were taken to hospital and two were treated at the scene.