Streets around Parliament Square were blocked off as police vehicles swarmed the area, video posted on social media showed. More than a dozen emergency vehicles were on the scene. Wider cordons have since been removed, while cordons around the immediate crime scene will remain for some time, police said.

\"PHOTO:
Andy Rain/REX via Shutterstock
PHOTO: Armed police at St. Thomas' hospital close to the scene of an incident at Houses of Parliament in London, Aug. 14, 2018.
>

The Westminster subway station re-opened after it had been closed earlier, the official Transport for London feed said in a tweet.

President Donald Trump weighed in, tweeting, \"Another terrorist attack in London...These animals are crazy and must be dealt with through toughness and strength!\"

Another terrorist attack in London...These animals are crazy and must be dealt with through toughness and strength!

— Donald J. Trump (@realDonaldTrump) August 14, 2018

The threat to the U.K. remains severe, British Prime Minister Theresa May said in a statement.

\"I would urge the public to remain vigilant -- but also to come together and carry on as normal, just as they did after the sickening attacks in Manchester and London last year,\" she said. \"The twisted aim of the extremists is to use violence and terror to divide us. They will never succeed.\"

\"My thoughts are with those injured in the incident in Westminster and my thanks to the emergency services for their immediate and courageous response.\" - PM @theresa_may

— UK Prime Minister (@10DowningStreet) August 14, 2018

This appears to be the second attack on Westminster in the past 18 months. In March 2017, 52-year-old Khalid Masood, a Muslim convert with a criminal past, crashed his rented car into pedestrians on Westminster Bridge and later stabbed a police officer outside of the parliament building. Four people died in the attack, including the officer. Masood was shot and killed by police.

\"PHOTO:
Andy Rain/REX via Shutterstock
PHOTO: Police at the scene of an incident outside parliament in London, Aug. 14, 2018.
>

Since then, 12 terror plots have been thwarted in the U.K., Andrew Parker, director general of the MI5, the U.K.'s domestic counterintelligence and security agency, said in a speech in Berlin in May.

Parliament was not in session on Tuesday. The House of Commons and House of Lords are out of session from July 24 to Sept. 4.

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