A dog that attacked a team of five police officers during a raid in London is said to have previously attacked a passerby in 2011 according to The Guardian newspaper. The British paper reports:
Scotland Yard admitted it failed to pick up on intelligence that the "pit bull-type" animal lived at the address in Albert Square in Newham, east London before they stormed the property. One constable may require skin grafts on his body and all five officers needed hospital treatment for leg and hand wounds after Thursday's frenzied assault. Two officers remained in hospital overnight and were in a stable condition. The dog was shot dead at the scene by a marksman from the Metropolitan police's CO19 firearms unit and its owner, a man in his 20s, was arrested for grievous bodily harm and kidnapping.Why Do Dogs Bite?