Before he killed at least four people in Britain's deadliest attack since the 2005 London bombings, Khalid Masood was considered by intelligence officers to be a criminal who posed little serious threat.
Metropolitan Police Acting Deputy Commissioner and Head of Counter Terrorism Mark Rowley said in a statement that a total of nine persons remain in custody and one woman has been released on bail.
'Did Islam kill those five people in London?' 'Or did one wacko individual do them in?' asks Vaihayasi Pande Daniel.
Who were they? What led them to mass murder?