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Three French teenagers on a school trip were among 20 injured when a car mowed down tourists during a terror attack in Westminster.

One of the three students, aged between 15 and 16, was thrown onto the roof of the car which ploughed into crowds of pedestrians at 2.40pm on Wednesday, according to French newspaper Le Telegramme.

Four people, including a police officer and the suspect, were killed in the attack, Scotland Yard said.

The pupils from a school in Concarneau, Brittany, had arrived in London on Sunday evening.

A spokeswoman for the Lycee Saint-Joseph de Concarneau confirmed three students were injured but said she could give no further information.

Attack at Parliament, March 22, 2017 36 show all Attack at Parliament, March 22, 2017 1/36 A policeman points a gun at a man on the floor as emergency services attend the scene outside the Palace of Westminster, London Stefan Rousseau/PA 2/36 Emergency services at the scene outside the Palace of Westminste PA 3/36 The scene of the incident @Lukesteele4 4/36 The scene at Westminster bridge this morning, the day after a terrorist attack Jeremy Selwyn 5/36 The scene at Westminster bridge this morning, the day after a terrorist attack Jeremy Selwyn 6/36 The scene at Westminster bridge this morning, the day after a terrorist attack Jeremy Selwyn 7/36 The flag above the Houses of Parliament in London flies at half mast the day after a terrorist attack Jeremy Selwyn 8/36 A forensics tent on Westminster Bridge seen from Victoria Embankment in London the day after a terrorist attack Jonathan Brady/PA 9/36 Police officers walk accross Westminster Bridge the morning after an attack by a man driving a car and weilding a knife Darren Staples/Reuters 10/36 Emergency services at the scene outside the Palace of Westminster Stefan Rousseau/PA 11/36 A knife on the cobbles at the scene outside the Palace of Westminster, London Stefan Rousseau/PA 12/36 Conservative MP Tobias Ellwood (centre) helps emergency services attend to a police officer outside the Palace of Westminster, London Stefan Rousseau/PA 13/36 A man lies injured after a shooting incident on Westminster Bridge in London Toby Melville/Reuters 14/36 Injured people are assisted after an incident on Westminster Bridge Toby Melville/Reuters 15/36 Police secure the area on the south side of Westminster Bridge close to the Houses of Parliament in London Matt Dunham/AP 16/36 An armed police officer runs accross the road during an incident on Westminster Bridge in London Toby Melville/Reuters 17/36 A member of the public is treated by emergency services near Westminster Bridge and the Houses of Parliament Carl Court/Getty Images 18/36 A member of the public is treated by emergency services near Westminster Bridge and the Houses of Parliament Carl Court/Getty Images 19/36 The scene outside the Houses of Parliament 20/36 The area around Westminster was put on immediate lockdown BBC 21/36 Police outside the Palace of Westminster, London Victoria Jones/PA 22/36 Westminster Bridge 23/36 Theresa May during Prime Minister's Questions before the incident PA 24/36 A police officer stops traffic as the Jagaur car of British Prime Minister Theresa May is driven away Daniel Leal-Olivas/AFP/Getty Images 25/36 A image of armed police inside Parliament @BarryGardiner 26/36 Emergency services close to the Palace of Westminster, London Yui Mok/PA 27/36 Police close to the Palace of Westminster, London Victoria Jones/PA Wire 28/36 Police close to the Palace of Westminster, London Yui Mok/PA 29/36 An Air Ambulance outside the Palace of Westminster Victoria Jones/PA 30/36 Emergency personnel close to the Palace of Westminster Yui Mok/PA 31/36 Police forensic officers on Westminster Bridge, close to the Palace of Westminster Dominic Lipinski/PA 32/36 People remain in pods on the London Eye after it was stopped Jonathan Brady/PA 33/36 Mark Rowley, Assistant Commissioner for Specialist Operations in the Metropolitan Police, speaking outside Scotland Yard in London Victoria Jones/PA 34/36 Westminster Bridge BBC 35/36 Emergency services make their way down the river Jack Taylor/Getty Images 36/36 Members of the public wait at locked doors outside St Thomas' hospital Carl Court/Getty Images 1/36 A policeman points a gun at a man on the floor as emergency services attend the scene outside the Palace of Westminster, London Stefan Rousseau/PA 2/36 Emergency services at the scene outside the Palace of Westminste PA 3/36 The scene of the incident @Lukesteele4 4/36 The scene at Westminster bridge this morning, the day after a terrorist attack Jeremy Selwyn 5/36 The scene at Westminster bridge this morning, the day after a terrorist attack Jeremy Selwyn 6/36 The scene at Westminster bridge this morning, the day after a terrorist attack Jeremy Selwyn 7/36 The flag above the Houses of Parliament in London flies at half mast the day after a terrorist attack Jeremy Selwyn 8/36 A forensics tent on Westminster Bridge seen from Victoria Embankment in London the day after a terrorist attack Jonathan Brady/PA 9/36 Police officers walk accross Westminster Bridge the morning after an attack by a man driving a car and weilding a knife Darren Staples/Reuters 10/36 Emergency services at the scene outside the Palace of Westminster Stefan Rousseau/PA 11/36 A knife on the cobbles at the scene outside the Palace of Westminster, London Stefan Rousseau/PA 12/36 Conservative MP Tobias Ellwood (centre) helps emergency services attend to a police officer outside the Palace of Westminster, London Stefan Rousseau/PA 13/36 A man lies injured after a shooting incident on Westminster Bridge in London Toby Melville/Reuters 14/36 Injured people are assisted after an incident on Westminster Bridge Toby Melville/Reuters 15/36 Police secure the area on the south side of Westminster Bridge close to the Houses of Parliament in London Matt Dunham/AP 16/36 An armed police officer runs accross the road during an incident on Westminster Bridge in London Toby Melville/Reuters 17/36 A member of the public is treated by emergency services near Westminster Bridge and the Houses of Parliament Carl Court/Getty Images 18/36 A member of the public is treated by emergency services near Westminster Bridge and the Houses of Parliament Carl Court/Getty Images 19/36 The scene outside the Houses of Parliament 20/36 The area around Westminster was put on immediate lockdown BBC 21/36 Police outside the Palace of Westminster, London Victoria Jones/PA 22/36 Westminster Bridge 23/36 Theresa May during Prime Minister's Questions before the incident PA 24/36 A police officer stops traffic as the Jagaur car of British Prime Minister Theresa May is driven away Daniel Leal-Olivas/AFP/Getty Images 25/36 A image of armed police inside Parliament @BarryGardiner 26/36 Emergency services close to the Palace of Westminster, London Yui Mok/PA 27/36 Police close to the Palace of Westminster, London Victoria Jones/PA Wire 28/36 Police close to the Palace of Westminster, London Yui Mok/PA 29/36 An Air Ambulance outside the Palace of Westminster Victoria Jones/PA 30/36 Emergency personnel close to the Palace of Westminster Yui Mok/PA 31/36 Police forensic officers on Westminster Bridge, close to the Palace of Westminster Dominic Lipinski/PA 32/36 People remain in pods on the London Eye after it was stopped Jonathan Brady/PA 33/36 Mark Rowley, Assistant Commissioner for Specialist Operations in the Metropolitan Police, speaking outside Scotland Yard in London Victoria Jones/PA 34/36 Westminster Bridge BBC 35/36 Emergency services make their way down the river Jack Taylor/Getty Images 36/36 Members of the public wait at locked doors outside St Thomas' hospital Carl Court/Getty Images

Meanwhile, French President Francois Hollande said: "Terrorism concerns us all and France knows how the British people are suffering today.

"We are doing everything to find out if French nationals have been involved."

Matt Haikin, 44, cycled across the bridge just moments after the attack.

He told the Standard: “I saw a car and as I came up to it I noticed someone next to it covered in blood.

“There were people standing around and others running towards. I assumed it was just an accident.”

The car then smashed into the railings of Westminster Palace before a knifemen stabbed a police officer to death.

Mr Haikin added: “Fairly shortly after I heard some shots. I thought then that something was going on.

“As I went over to see what was going on they were starting to move people back.

“I think I saw a couple of bodies on the ground. I couldn't tell if they were injured.”

Images emerged on social media of groups of school pupils being led away from the Houses of Parliament.

It is believed that more than 100 youngsters, who appeared to be aged between eight and 12, had been on educational visits to Westminster during the attack.

They are thought to have been kept within cordon inside the building.

Witnesses described some as “visibly shaken by what they had experienced” and “tearful”, Sky News reported.

Scotland Yard confirmed the incident is being treated as a terror attack and have deployed extra armed police across the capital.