New York city police have bolstered security in British sites in a bid to deter further attacks
Heavily armed officers, explosives and detecting dogs have been deployed in locations including the British Consulate and the British Mission to the United Nations in Manhattan, senior New York Police Department officials have confirmed.
James Waters, the Police Department’s Counter-Terrorism Chief, said: "You'll see a larger presence of the dogs at these locations, as well as (officers) armed with the long guns.”
The assailant drove across Westminster Bridge ploughing into a crowd of people shortly after 2.30pm on Wednesday afternoon.
He went on to crash into Parliament gates, before turning to fatally stab a police officer named as the 48-year-old Keith Palmer, a husband and a father.
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
The attacker was then shot dead by another officer.
James O'Neill, a US Police Commissioner said that while authorities were concerned about copycat attacks, there was no specific threat to New York City on Wednesday.
The US Department of Homeland Security reportedly said it would lend support to Britain's investigation of the attack but the US security posture was unchanged.
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Westminster hours after the attack
London terror attack scene on Westminster Bridge
In a statement, the department said: “We are in close contact with our British counterparts to monitor the tragic events and to support the ongoing investigation.”
The PM confirmed the UK's terror threat level will remain at "severe” and condemned the attack as "sick" and "depraved".
The terror attack at Westminster Bridge and Parliament left five dead and at least 40 injured
President Donald Trump spoke to Theresa May shortly after the attacks. Sean Spicer, Mr Trump's spokesman, 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."