Asking WHY?? in your subject title implies that the police did WRONG. You have jumped to this conclusion because the "newspapers" said there might be a problem.Newspapers in Britain and also in the USA and Canada have always been very quick to bring the "NEWS" to people before all the facts are out.
I will reserve judgement on the actions of the police untill more time has passed.
I do look forward to your next post...."Massive Police Coverup in Deaths of Bombing Suspects"