In the months before the attack on Westminster, Khalid Masood had been living in Birmingham. Here's what we know about him so far.
WATCH: CCTV Footage After Attack In Birmingham
Police are still looking for four men who attacked two friends on a night out in Birmingham three months ago.
The pair were sitting on the steps in the Arcadian just after midnight on Friday 29 August when four men asked them for cash.
When they refused the group kicked them to their heads and faces repeatedly.
Police have now released CCTV footage of the group they would like to trace.
Investigating officer DC Alexandrea Backrath said: "This was a brutal attack on two young men who were just taking a breather while on an evening out.
All four are described as aged between 17 and 20 with short dark hair and average height. One wore a dark top with a white stripe down the arm, another wore a navy top and the other two wore dark clothing.
Two men from Birmingham remain in custody after a search for accomplices to the Westminster terror attack has seen 11 arrested this week.
A total of seven people have now been arrested after raids in Birmingham over the terror attack in Westminster.
Jess Phillips MP has written to pupils at Holy Family Catholic Primary school, who were in Westminster yesterday.
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