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Westminster is in lockdown following an apparent terrorist attack
April 30 2017, 06:46 | Alonzo Simpson
How British MPs Crawled On Hands And Knees To Escape Westminster Attack
Speaking outside Scotland Yard on Wednesday night, Mark Rowley, the Met's senior anti-terror officer, said of PC Palmer: "Today in Westminster we saw tragic events unfold and our thoughts are with those who lost loved ones, those who were injured and all those affected by this attack".
"You'll see a larger presence of the dogs at these locations, as well as (officers) armed with the long guns", said James Waters, the police department's counterterrorism chief.
The Westminster terrorist was previously known to security services and had once been investigated by MI5 over violent extremism.
Addressing the House of Commons, the lower house of the British parliament, on the morning after the attack, a sombre Mrs May said the attempt to "silence our democracy" had failed.
The attack Khalid Masood carried out was the end point of his evolution to extremist from the boy born in Kent and named Adrian Elms.
Masood would later mask his life of crime with a CV which claimed he was an experienced English teacher who had worked across the world. The working assumption was that the perpetrator of the driving and stabbing attacks that left four victims dead and dozens more injured was a Muslim before the assailant was even identified.
Some commentators have questioned how the assailant, whose birth name was Adrian Russell Ajao, was able to get so close to parliament. "The terrorist was also shot dead".
Police say Masood has had a string of convictions between 1983 and 2003 for offenses including assault and possession of an offensive weapon.
He had never been convicted of a terrorism offense and he was not part of any current intelligence investigations.
In a statement, the Metropolitan Police said there was "no prior intelligence about his intent to mount a terrorist attack".
Did Khalid Masood have links to ISIS? The Islamic State terror group claimed responsibility behind Britain's deadliest terror attack in 12 years.
Britain's Prime Minister, Theresa May, is said to have been in the division chamber, voting after Prime Minister's Questions, when she was whisked away by a plain-clothes police officer.
An American man from Utah, a British man and a British woman were killed on the bridge, and police officer Keith Palmer died at Parliament. But these attackers are hardly alone.
"The location of this attack was no accident", May continued.
Eight people have been arrested after raids at six addresses in London, Birmingham and elsewhere.
Prime Minister May hailed the millions of people in London who went about their lives the day after the attack. One woman detained earlier was released on bail.
On Wednesday, a driver, now identified by police as Masood, plowed a vehicle through pedestrians walking along Westminster Bridge, leaving a trail of injuries and deaths.