Last year Durham Constabulary recorded its lowest number of fatal accidents since the present force boundaries were created in 1974.

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The force said incidents like the fatal stabbings of two Big Issue sellers and teenager Christina Edkins in Birmingham were "mercifully rare".

BBC: Knife crime down by 25% in West Midlands

He grabbed a knife, which is why fatal force was used, according to a source briefed on the ongoing investigation.

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She said the force had dealt with a number of "terrible" knife crimes in the past few months including the fatal stabbing of Christina on a bus in in March but she said these incidents should be "viewed in context".

BBC: Knife crime down by 25% in West Midlands