Counter-terrorism investigators are piecing together the life of Khalid Masood, the 52-year-old who killed four people and injured more than 50 in Wednesday's attack in Westminster. Police are working to determine whether he acted alone or was supported by others.
On Thursday, two men were arrested in Birmingham and Manchester, while properties in Wales and southern England were searched. Eight other suspects have been released without charge. Police believe Masood used the WhatsApp messaging app two minutes before the attack, but the content of the message remains unknown.
Masood, born Adrian Elms, had a criminal record spanning 20 years, including a jail term for grievous bodily harm after stabbing a man in the face. He converted to Islam over a decade ago and used several names. On the eve of the attack, he checked into a Brighton hotel under his own name, where staff described him as 'laughing and joking'.
Mark Rowley, Britain's top counter-terrorism officer, said: 'Whilst there is no evidence of further threats, you will understand our determination to find out if he either acted totally alone inspired by terrorist propaganda or if others have encouraged, supported or directed him.'
The fourth victim was named as 75-year-old Leslie Rhodes. Two people remain in critical condition in hospital. Police are appealing for anyone who knew Masood or his associates to come forward.
