The full background of a terrifying raid on a Redditch family, during which a mother was threatened with an axe, remains a mystery, detectives have revealed.
Imran Aslam, from Dudley, was one of four men who attacked a couple in their own home as their children were in the bath in July 2011 - but he has refused to cooperate with the police investigation into the incident.
Det Cons Lindsey Coleman, of West Mercia Police, said his lack of cooperation meant the reason behind the raid, and the identity of his partners, was still unknown.
She welcomed his eight-year prison sentence.
This incident was a terrifying ordeal for the family.
The gang were extremely aggressive, showing no regard for the fact that there were young children in the house and it has had a long term impact upon them all.
It has been a long and complex inquiry and while we still don’t know the full background to this incident, because Aslam has not spoken to us about that, we hope it gives the family some peace of mind that he has received a lengthy jail sentence.
Fortunately offences of this nature are extremely rare but when they do happen we will use all the resources available to us to bring offenders to justice.
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The assault is alleged to have taken place more than two years ago in Birmingham.
His victim, who was bed ridden, died four weeks later.
Police say that although the robbers made off with cash, nobody was injured in the siege.