Bloodthirsty Islamic radicals have struck again — this time just outside the United Kingdom Parliament.
A vehicle mowed down pedestrians on London’s Westminster Bridge, killing at least three and leaving scores of innocent victims with injuries described as catastrophic. Then, the knife-wielding terrorist stabbed and killed a police officer before being shot on the grounds outside Britain’s Parliament, sending the compound into lockdown.
Authorities said they were treating the attacks as a terrorist incident. Some of those injured were French high school students on a field trip, France’s prime minister said.
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The threat level for international terrorism in the U.K. was already listed at severe. Wednesday was the anniversary of suicide bombings in the Brussels airport and subway that killed 32 people, and the latest events echoed recent vehicle attacks in Berlin and Nice, France.
Prime Minister Theresa May, who was rushed from the building within minutes, will chair a meeting of the government emergency committee. London Police Commander B.J. Harrington said a full counterterrorism investigation was underway.

A man, identified as the suspected attacker, is treated by emergency services, as knives lie on the ground. (Stefan Rousseau/PA via AP).
The incident in London unfolded within sight of some of the city’s most famous tourist sites, including the London Eye, a large Ferris wheel with pods that overlook the capital. It stopped rotating and footage showed the pods full as viewers watched police and medical crews on the bridge, which has at its north end Big Ben and Parliament, two iconic symbols.
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“The whole length of the bridge there were people on the ground,” Richard Tice, a witness, told Sky News. The London Ambulance Service said it had treated at least 20 people on the bridge, and British port officials said a woman was pulled from the River Thames, injured but alive.
“There were some with minor injuries, some catastrophic. Some had injuries they could walk away from or who have life-changing injuries,” she said.
French Prime Minister Bernard Cazeneuve offered support to the British and to “the French students wounded, their families and their schoolmates.” London is a common destination for French school trips.
The French Foreign Ministry said that three students on a school trip from Saint-Joseph in the Brittany town of Concarneau were among the injured. The ministry said it was in contact with British authorities.
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Witness Rick Longley told the Press Association that he heard a bang and saw a car plow into pedestrians and come to a crashing stop. Images from the scene showed pedestrians sprawled on the ground, with blood streaming from a woman surrounded by a scattering of postcards.
“They were just laying there and then the whole crowd just surged around the corner by the gates just opposite Big Ben,” he said. “A guy came past my right shoulder with a big knife and just started plunging it into the policeman. I have never seen anything like that. I just can’t believe what I just saw.”
At Parliament, a body was seen lying in the yard. It wasn’t clear if it was the attacker.
Dennis Burns, who was just entering Parliament for a meeting, told the Press Association he heard a radio message saying an officer had been stabbed. Police and security rushed outside as he was going in.
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“When I got inside I was wondering what the hell was going on and I saw dozens of panicked people running down the street,” he said. “The first stream was around 30 people and the second stream was 70 people. It looked like they were running for their lives.”
Daily Mail journalist Quentin Letts said he saw a man in black attack a police officer outside Parliament before being shot two or three times as he tried to storm into the House of Commons.
“As this attacker was running towards the entrance two plain-clothed guys with guns shouted at him what sounded like a warning, he ignored it and they shot two or three times and he fell,” he said.
As lawmakers were voting inside Parliament, they reported hearing the sound of gunshots.
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Parliament was locked down for two hours, and the subway station outside was shuttered.
British security has thwarted some 13 terror plots over the past four years, but the UK has largely been spared major international terror attacks such as the ones seen in Belgium and France.
Last year, a radical Islamic terrorist stabbed three people at a train station in east London in response to the Royal Air Force’s bombing of the Islamic State group in Syria.
The most gruesome recent attack occurred in 2013 when two Muslim converts attacked Lee Rigby, a British Army soldier who was walking down the street. The men ran Rigby down with their vehicle and then used a cleaver to hack him to death and behead him as bystanders watched in horror.
The worst peace time attack on Britain this century was on July 7, 2005, when four Al Qaeda-inspired bombers, one an immigrant, blew themselves up on three subway trains and a bus in London, killing 52.
The Associated Press contributed to this article