Mark Rowley said two more arrests were made
Police made the arrests overnight in the West Midlands and the North West of England, Mark Rowley, the Met Police Assistant Commisioner, said during a briefing this morning.
The number of arrests has now risen to ten.
He revealed two of the victims of Khalid Masood's attack remain in critical condition in hospital.
Masood's birth name was Adrian Russell Ajao, Scotland Yard added.
Answering a question about how he had been radicalised, Mr Rowley, said: "Clearly that’s a main line of our investigation. What led him to be radicalised? Was it through influences in our community, influences from overseas or influences from online propaganda?
"Our investigations, our arrests will help in that but the public appeal will make a big difference in that, if people come forward with more information.
"It would be wrong for me to say any more than what the Prime Minister said in Parliament yesterday.
But, we’re looking at his history. Several years ago he had been a peripheral figure, he’s never been part of the mainstream intelligence picture about terrorism."
The fourth victim was named as 75-year-old Leslie Rhodes, of Stretham, south London.
He died in hospital yesterday after his life support was pulled.
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