Scotland Yard say two more "significant arrests" have been made in connection with the terror attack on Westminster.
This was announced by Scotland Yard's top anti-terror officer Mark Rowley, who also revealed what was believed to be Khalid Masood's birth name.
Rowley confirmed the two suspects were held overnight in the West Midlands and the north west of the country, and appealed for the public to come forward with any information about Masood.
He said: "We are keen to hear from anyone who knew Khalid Masood, understands who his associates were, and can inform us about places he has recently visited.
"There might be people out there who did have concerns about Masood, but might not have felt comfortable for reasons unknown to pass those concerns on to us."