Charlie Sarell, regional organiser for Unison is "not confident" that public want private firms to help police.
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Part of the branch has gone straight through the windscreen of the car and struck an 8 year old girl in the back.
A fundraising page has been set up to help pay for the funeral of a five-year-old boy who died at a water park.
Angry spectators bombarded police officers with fireworks during a crackdown on street racing in Birmingham.