You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "The murders of which police officers led to Dale Cregan being sentenced to life in prison?" whose answer is Nicola Hughes and Fiona Bone.
Each document should contain about 30 words, and these documents should contain useful information.

Query: Dale Cregan murdered police officers
Useful Output:

Doc 1: A colleague of murdered police officers Fiona Bone and Nicola Hughes filled out his own death report before being found dead in a park,
Doc 2: Cregan is accused of murdering Mark Short in The Cotton Tree pub, Droylsden, on 25 May and David Short on 10 August at his home in Clayton.
Doc 3: It started with a bottle thrown in a pub, and ended in the deaths of four people, father and son David and Mark Short, and police officers, Fiona Bone and
Doc 4: On 18 September 2012, two Greater Manchester Police officers, Nicola Hughes and Fiona Bone, were killed by Dale Cregan in a gun and grenade
Doc 5: Andrew Summerscales was left in 'a very dark place' after Nicola Hughes and Fiona Bone were killed by Dale Cregan in 2012.