In the months before the attack on Westminster, Khalid Masood had been living in Birmingham. Here's what we know about him so far.
Four Arrests Over Murder Of Hereford Man
Four people have been arrested over the death of a man in Hereford found stabbed on Father's Day last year.
Two men are being questioned on suspicion of murdering Christian Bagley, as he walked under Hunderton Bridge on the night of June 21st 2015.
Two women are being held on suspicion of assisting an offender.
West Mercia Police have released a statement to Heart about the arrests:
"Detectives have arrested four people from Hereford in connection with the death of Christian Bagley who died on Father's Day last year (June 21 2015).
"Two men, aged 27 and 36, have been arrested on suspicion of murder and remain in police custody at this time.
"Two women, aged 34 and 51, were also arrested on suspicion of assisting an offender and conspiracy to pervert the course of justice. They have both released on bail.
"A murder investigation has been ongoing since Christian's death last year when he suffered two stab wounds as he walked under the Hunderton Bridge in Hereford. Christian collapsed in Rogers Avenue at approximately 10.50pm and was pronounced dead a short time later.
"Detectives are continuing to appeal for any information and would like to remind the community that a £10,000 reward is available for any information which leads to the arrest and conviction of those responsible for Christian's death. Anyone with information is asked to come forward to police by calling the non-emergency 101 number quoting the incident reference 717s 21 June 2015."
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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