Investigators lacked basic information on London attacker

"To that end in our continuing investigation and ongoing covert activity we have made two further significant arrests overnight", he said.

Four days after the 82-second massacre took place on Westminster Bridge and outside the Houses of Parliament, killing four as well as the attacker, detectives continue to appeal for anyone who spoke to Masood in recent months to come forward.

Born in southeastern England, Masood had most recently been living in Birmingham.

London's Metropolitan Police said in a statement that Masood was known by "a number of aliases".

During searches of 21 addresses around the country, including five that are ongoing, police have seized 2,700 items, including "massive amounts" of computer data, Britain's top counter-terror police officer, Acting Deputy Commissioner Mark Rowley said Friday.

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Little else is known about the 52-year-old, who plowed an SUV through pedestrians on Westminster Bridge before stabbing a police officer to death outside the Parliament in an attack later claimed by ISIS.

"Most terrorists are younger men", said Richard Walton, the former London Police head of counterterrorism. Among the victims who were being treated at hospitals, one was considered to have life-threatening injuries and two people were in critical condition.

Retired window cleaner Leslie Rhodes, 75, from Clapham, south London, was pronounced dead on Thursday evening when his life support machine was turned off.

The man believed to have been responsible for the terrorist attack in Westminster has been identified as 52-year-old Khalid Masood. Rhodes died Thursday evening after his life support machine was turned off. USA tourist Kurt Cochran, 54, was also a victim of the attack Wednesday.

The source said authorities had "no intelligence about how he got to this point" immediately after the attack and that he had been a "very marginal" figure when his name featured in a previous investigation. "Nine people remain in our custody and one woman has been released on bail".

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Ten people have now been arrested in relation to Wednesday's attack that left four victims dead and 40 injured. His last conviction was in December 2003 for possession of a knife.

The family of a police officer who was hit by a vehicle on Westminster Bridge during a horrifying terror attack have described how a day of celebration became a day of tragedy.

Police believe Masood acted alone, but Rowley said police are investigating whether he "acted totally alone inspired by terrorist propaganda, or if others have encouraged, supported or directed him".

Rowley said on Friday that the birth name of the man behind the assault was Adrian Russell Ajao and not Adrian Elms as previously reported.

"He had a young child, who I'd think was about 5 or 6 years old".

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