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Armed patrols around UK's Wembley Stadium

Press Association logoPress Association 25/03/2017

British terrorist Khalid Masood's murderous spree took just 30 seconds from mounting the pavement on the Westminster Bridge to crashing into the perimeter fence at Parliament.

Within less than a minute he made his way on to the parliamentary estate, attacked Police Constable Keith Palmer, and was shot.

Police believe Masood acted alone on the day of the attack, and warned that while they continue to investigate why he committed the atrocity "that understanding may have died with him".

Deputy Assistant Commissioner Neil Basu, the senior national co-ordinator for UK counter terrorism policing, said: "We still believe that Masood acted alone on the day and there is no information or intelligence to suggest there are further attacks planned".

"We must all accept that there is a possibility we will never understand why he did this. That understanding may have died with him."

He said officers are working to establish whether Masood was "a lone actor inspired by terrorist propaganda or if others have encouraged, supported or directed him".

"Whilst the attack lasted only 82 seconds it will remain in the memories of many forever."

Fears Masood was groomed for extremism in prison have heightened after it was claimed he turned to Islam behind bars.

Counter-terrorism officers have spent days piecing together what led the 52-year-old to shed his birth name and later unleash carnage on the capital.

Only one man, 58, arrested in Birmingham remains in police custody after a 27-year-old man was released with no further action on Saturday.

A total of 11 people were initially held after raids across the country.

The Saudi Arabian embassy in London said Masood worked in the country, home to some of the most virulent Islamic extremism, for several years, raising the possibility he was radicalised overseas.

A childhood friend of the man then known as Adrian Elms told The Sun newspaper he first emerged as a Muslim after serving a jail sentence.

His abrupt religious conversion will fuel concerns about the rising threat of criminals being brought under the influence of hardened jihadists while in prison.

Ministers have announced plans to create specialist units within jails to tackle what a government-ordered review last year concluded was a "growing problem".

His route to extremism could have also come from a stint living in the Middle East.

The Saudi embassy said Masood lived in the country between November 2005 and 2006 and April 2008 and April 2009, during which time he worked as an English teacher on a work visa, travelling to the country again for five days in March 2015.

Details of Masood's history of criminality have continued to come to light, suggesting a propensity for violence which laid the groundwork for his armed rampage.

The middle-aged Muslim convert was born in Kent, but moved around the country and used a variety of aliases including Adrian Russell Ajao.

Masood was known to police and MI5 but was a "peripheral figure" who was not implicated in any current probe.

He had convictions for assaults, including grievous bodily harm, possession of offensive weapons and public order offences.

Besides Masood four people died in the attack and two people remain in hospital in a critical condition, one with life-threatening injuries.

Police said armed patrols would take place around Wembley Stadium and extra officers would be at the ground when England played a World Cup qualifier against Lithuania on Sunday.

There will also be a minute's silence before the 5pm kick-off.

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