The US President praised Theresa May for being strong
In what has been the US President’s first tweet since the attack which killed five and injured 40, Trump branded the Prime Minister as "strong".
On Twitter, Trump said: “Spoke to UK Prime Minister Theresa May today to offer condolences on the terrorist attack in London. She is strong and doing very well.”
According to reports, the Prime Minister was just 50 yards away from the incident outside Parliament when she was driven to safety.
Mrs May, who was in the voting lobby by the Commons, was seen being bundled into the back seat of her silver Jaguar surrounded by armed guards at around 2.45pm, the Daily Mail reported.
Shortly after the attack was announced, Downing Street sources declined to say where Theresa May had been taken to safety but insisted “she had not been involved”.
London Terror Attack: LIVE PICTURES Wed, March 22, 2017
Two dead, 12 injured as knifeman mows into crowd in Westminster
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Conservative MP Tobias Ellwood (centre) helps emergency services attend to a police officer outside the Palace of Westminster, London
Trump’s comments come after Sean Spicer, the White House Press Secretary said "the city of London and Her Majesty’s Government have the full support of the US government".
A statement from the White House read: “[Mr Trump] pledged the full cooperation and support of the United States Government in responding to the attack and bringing those responsible to justice."
The Houses of Parliament were on lockdown and MPs were inside for at least three hours
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As President Trump attempted to strengthen his relationship with Mrs May, his son Donald Trump Jr. attacked the Mayor of London for allegedly giving into terrorism.
He tweeted: "You have to be kidding me?!: Terror attacks are part of living in big city, says London Mayor Sadiq Khan."
New York city police have increased their police presence around UK landmarks
But in turn he received widespread criticism, including from Wes Streeting, the MP for Ilford North and former president of the National Union of Students.
Mr Streeting said: “You use a terrorist attack on our city to attack London’s Mayor for your own political gain. You’re a disgrace."
Heavily armed officers, explosives and detecting dogs have been deployed across New York city including the British Consulate and the British Mission to the United Nations in Manhattan in a bid to deter “copycat attacks”.