But former murder squad Detective Chief Inspector Pete Kirkham believes stun guns have become the weapon of choice for many criminals.

BBC: Stun guns bought via mail order come through UK Customs

But Detective Chief Inspector Martin Bottomley, of Greater Manchester Police, said the sentences showed that violence was not the answer to the town's problems.

BBC: Irfan Khalil and Mohammed Farooq

Police will review evidence that came out during trial and could decide to seek additional charges, Detective Chief Inspector Chris Ankers said.

CNN: British court convicts parents in 'honor' murder