Police have appealed for anyone with any information on the prison van attack in Salford, Manchester, to contact 0161 856 5665/5237.
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The 'Let Our Kids Be Kids' campaign wants parents to keep their children off school saying they are "over-tested and over-worked".
Nicky Morgan is expected to defend the proposal when she fields questions at the National Association of Head Teachers' annual conference.
Phone charges in the European Union will drop by about 75 per cent from today as part of an interim cap ahead of a full ban next year.