In the months before the attack on Westminster, Khalid Masood had been living in Birmingham. Here's what we know about him so far.
Criminal Investigation Into Stafford Case
A criminal investigation has begun into the death of a woman at scandal-hit Stafford Hospital, the Health and Safety Executive (HSE) has said.
Gillian Astbury died after slipping into a diabetic coma at the hospital in 2007.
An inquest into her death found that the failure to administer insulin to the 66-year-old amounted to a gross failure to provide basic care.
An HSE spokesman said: 'Following legal advice, HSE deferred a decision to pursue the investigation into Gillian Astbury's death until the conclusion of the public inquiry, chaired by Robert Francis QC, into Mid Staffordshire NHS Foundation Trust.
''We can now confirm that our inspectors have today formally started an investigation.
''Our focus will be on establishing whether there is evidence of the employer (the Trust) or individuals failing to comply with their responsibilities under the Health and Safety at Work Act.''
The report by Mr Francis highlighted ''appalling and unnecessary suffering of hundreds of people'' at the Trust between 2005 and 2009.
As many as 1,200 patients may have died needlessly after they were ''routinely neglected'' at the hospital.
Many were left lying in their own urine and excrement for days, forced to drink water from vases or given the wrong medication.
Mrs Astbury, from Hednesford, Staffordshire, died in the early hours of April 11 2007 while being treated for fractures to her arm and pelvis.
Jurors at the September 2010 inquest found that a contributory factor in her death was a systemic failure to provide adequate nursing facilities and low staffing levels.
Returning a narrative verdict after the two-day hearing, the 10-member panel also said another contributory factor was the failure of nursing staff to record glucose levels, communicate properly with each other and read clinical notes.
In its verdict, the jury said: ``We are satisfied that there were serious shortcomings in systems and in implementation, monitoring and management of the systems in place.
''Nursing facilities were poor, staff levels were too low, training was poor, and record-keeping and communications systems were poor and inadequately managed.''
The inquest heard that Mrs Astbury's blood sugar levels were not properly monitored and insulin was not administered on the day before her death, despite being prescribed by doctors.
Some of the nursing staff were also not informed that Mrs Astbury was diabetic and some said they were too busy to check the patient notes at the foot of her bed.
A police investigation was launched after her death, but the Crown Prosecution Service ruled that there was insufficient evidence to bring charges.
In a statement issued by the Mid Staffordshire NHS Foundation Trust, its director of quality and patient experience, Julie Hendry, said: ''I would like to offer our sincere condolences to the family of Gillian Astbury for their sad loss and apologise for the appalling care Ms Astbury received at our hospital in April 2007.
''Ms Astbury's death was reported as a serious untoward incident at the time and a full investigation into her care and treatment was carried out.
''The recommendations from that investigation were implemented.
''Actions included raising staff awareness about the care of diabetic patients and improving the information and system for nurse handovers.''
Ms Hendry added: ``In 2010 we reviewed Ms Astbury's dreadful care and, as a result, disciplinary action was taken.
''We will, of course, co-operate fully with the Health and Safety Executive's investigation.''
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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