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The mother of a French schoolboy injured in the Westminster terror attack has told how she and her husband believed their son had died.
The teenager, known only as Thomas, was one of three pupils hurt as they walked along Westminster Bridge during a school trip to London.
Thomas suffered a head injury and fractures to his legs, his mother - who has not been named - told French media.
The students, aged between 15 and 16, were pupils from Lycee Saint-Joseph de Concarneau, Brittany.
The teenager's mother said: "It was the school who told us yesterday afternoon that the attack had taken place and our son was one of the victims.
"At that time, we had no idea about his health. My husband and I thought he had died. After an hour, we were told he was injured. It felt extremely long."
Thomas' parents were rushed to London on Wednesday evening to see their son, who she said was "relieved and happy to see us".
She said the pupil had little memory of what happened and they had to explain to him "the attack, the runaway car on the bridge".
So-called Islamic State has claimed it was behind the Westminster terror attack which left four people dead, according to the IS-affiliated new agency Amaq.
In a statement the terror organisation said: "The attacker yesterday in front of the British Parliament in London was a soldier of the Islamic State executing the operation in response to calls to target citizens of coalition nations."
Professor Peter Neumann, director of the International Centre For The Study Of Radicalisation (ICSR) at King's College London, said: "You can be a lone attacker but you can still be radicalised as part of networks as part of, for example, a jihadist scene."
Dr Shiraz Maher, deputy director of the ICSR, said the West is seeing an increasing number of terrorist attacks using "unsophisticated methods".
He said: "These are plots that are very easy to construct, require little money, planning, and expertise, but which are nonetheless highly effective in causing death and destruction.
"We have already seen similar attacks in Nice and Florida, and the challenge for all of us is to now work out how we can identify and prevent these attacks before they occur."
Conservative MP James Cleverly has paid an emotional tribute to his friend Pc Keith Palmer, telling the Commons he was a "strong, professional public servant".
The Braintree MP said it was a "delight" to meet Pc Palmer again when he was elected to Parliament, and called for him to receive a "posthumous recognition".
Mr Cleverly said his "heart went out" to all those injured.
On Wednesday Mr Cleverly revealed that he served with Pc Palmer in the Royal Artillery.
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Responding to Mr Cleverly, the Prime Minister said: "I thank him for the obvious, not just compassion, but passion with which he has spoken about an individual he knew, and he bears witness to the tremendous public service that Keith Palmer had given this country in so many ways.
"Having served in our armed forces and then come here to this place and paid the ultimate sacrifice here at the heart of our democracy, I can assure (Mr Cleverly) that the issue that he's raised is of course one that will be considered in due course."
An eyewitness who was on Westminster Bridge when the attacker drove a car into people in Wednesday's terror attack, has told it sent people "flying, 20ft in the air".
"I managed to jump out of the way and hold on to the side of the bridge," said James Sheriff.
"I almost fell in the river, and then climbed back over.
"And then it [the car] just kept on going and people were just flying, going 20ft in the air.
"I think one young girl was dead next to me."
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