KEY POINTS:
- A van has driven into a group of people near at Seven Sisters Rd near London's Finsbury Park Station.
- Reports at least 10 have been injured, four possibly dead
- Emergency services seen doing CPR on some people
- The group were believed to have been worshipers leaving Ramadan night prayers.
- One person, believed to be the driver, has been arrested
At least 10 people are believed to have been injured, and four possibly killed, after a van drove into a group of Muslims who were leaving late-night prayers in North London.
Parts of Seven Sisters Rd near Finsbury Park Station have been cordoned off while emergency service workers try to help the injured.
Witnesses have described seeing the van plough into the group and the driver being wrestled to the ground and held down until police arrived.
Others have described watching emergency service workers doing CPR on the injured and managing to save at least one critically injured person.
Police have confirmed one person has been arrested and they are dealing with "a number of casualties" but not commented on whether anyone has died.
Al Jazeera Arabic is however reporting four people have been killed.
Local resident Alec Wilson tweeted he had never seen so many police and ambulances head down the busy road.One caller told LBC radio station people from a local mosque had been drinking coffee at a cafe by the mosque. He said he had seen six people on the floor.
Another caller said: "I saw police giving CPR, getting the heart going again and another guy on the floor."
Cynthia Vanzella tweeted: "Horrible to watch police officers doing cardiac massage at people on the floor, desperately trying to save them. I just hope they did."
The secretary-general of the British Muslim Council says he is shocked and outraged to hear a van had intentionally run over worshippers leaving Ramadan night prayers.
While police have yet to comment on the cause or whether it was an act of terrorism speculation has spread quickly on social media.
Mohammed Kozbar, chairman of Finsbury Park mosque, told the Sun: "Whoever did this, he did it to hurt people and it's a terrorist attack.
"We call it a terrorist attack as we called it in Manchester, Westminster and London Bridge."
The incident comes after a group of terrorists in a white van ploughed into pedestrians on London Bridge in early June.
Seven people were killed and 48 taken to hospital after the attackers stabbed people at random with hunting knives.
Police have not clarified where the group were coming from in the latest attack.
Mahir Dar tweeted it was a mosque in Seven Sisters Rd by the entrance of Finsbury Park station, not Finsbury Park mosque.
Mahir Dar tweeted it was a mosque in Seven Sisters Rd by the entrance of Finsbury Park station, not Finsbury Park mosque.
Finsbury Park Mosque - in the North London suburb of Islington - has a controversial history, and has been linked to extremist activity in the past.
Shoebomber Richard Reid and Zacarias Moussauoi attended the mosque, and in 2002 it was reported that weapons training took place there.
Several people are injured as a vehicle hits pedestrians in the Finsbury Park area of north London and, police says.
"There are a number of casualties being worked on at the scene. There has been one person arrested," police said in a statement on Monday.
After 12:20 am (2320 GMT), police received a report of collision on Seven Sisters Road, which runs through the Finsbury Park.
"There are a number of casualties being worked on at the scene," London police said. "There has been one person arrested."
According to some reports a van hit the crowd as at least one person was arrested in connection to the case.
“We have been informed that a van has run over worshippers as they left #FinsburyPark Mosque. Our prayers are with the victims,” said the Muslim Council of Britain (MCB), an umbrella body, on Twitter.
The head of the MCB, Harun Khan, also said in a tweet that the van had "intentionally" run over people leaving prayers during the holy month of Ramadan.
Three people were said to have been seriously injured near the mosque.
The incident bore the hallmarks of a terrorist attack in the British capital earlier this month.
Terror on and near the London Bridge left at least eight people dead and wounded almost 50 others on June 3.
Eight minutes after the first emergency call, armed police forces killed ringleader Khuram Butt, 27, Rachid Redouane, 30, and Youssef Zaghba, 22.
The three knife-wielding assailants drove a hired van into pedestrians on the bridge and stabbed others in Borough Market in an attack initially praised and subsequently claimed by the Daesh Takfiri group.
A similar attack on March 22 left five people dead after a man drove a rented car into pedestrians on Westminster Bridge in London and stabbed a policeman to death.
Terrorist alert has been set at "severe" in Britain, meaning an attack is highly likely.