Why did Home Office place Parsons Green bomber with foster family even though he was trained by jihadis and hated Britain?

Foster parents of an Iraqi refugee last night demanded to know why he was left free to carry out a Tube bombing.

Ahmed Hassan, 18, entered Britain on the back of a lorry and admitted to Home Office officials that he was trained to kill by Islamic State.

But blunders meant he was placed with the loving couple, who had no idea about his links to the terror group as he secretly built a deadly bomb in their home with a YouTube recipe.