In the months before the attack on Westminster, Khalid Masood had been living in Birmingham. Here's what we know about him so far.
West Midlands UKIP MEP Steps Down From Leadership Race
Ukip leadership candidate Bill Etheridge has withdrawn from the contest and called on rivals to back current deputy leader Paul Nuttall.
The West Midlands MEP and Dudley Metropolitan Borough Councillor said Mr Nuttall's declaration on Sunday had prompted him to step down, as he was the only candidate who could unite the party as it dealt with ``recent well publicised problems''.
Mr Etheridge was one of eight people vying to lead the party, with Mr Nuttall and former Conservative councillor Suzanne Evans viewed as the frontrunners.
In a withdrawal statement Mr Etheridge said: ``I always said that if a candidate better suited to take this party forward emerged I would back down and support them. That candidate has emerged.
``Paul Nuttall is not only a personal friend and an honourable man but I believe he is the only person who can effectively unite our party after the recent well publicised problems we have suffered.
``I will be supporting Paul and giving him my 100% backing. I call on all other potential candidates to follow my example and withdraw from the race to allow Paul to go forward from here and unite our party.''
Former party chief Nigel Farage stepped back into his role on a temporary basis after the resignation of Diane James just 18 days after she had been elected leader by Ukip members.
Ukip was then rocked again when Steven Woolfe, who was the frontrunner to replace Ms James, left in the wake of an altercation with another party member after which he ended up in hospital.
Mr Etheridge had promised to unite the party's warring factions after months of infighting described by Mr Woolfe as a ``death spiral of their own making''.
As he quit the race Mr Etheridge, who was elected in 2014, said he believed Ukip ``must remain a patriotic, libertarian party standing for the individual against the over-powerful state, and not be tempted into cultural nationalism and the so-called centre ground on economic policy.''
His withdrawal leaves seven candidates in the contest, after former Ukip parliamentary hopeful John Rees-Evans announced his intention to stand on Monday.
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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