Metropolitan Police Commissioner Sir Bernard Hogan-Howe said that he was "shocked" by allegations that undercover officers hunted for information to smear the family of murdered teenager Stephen Lawrence.
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The Hammers moved to the Olympic Stadium in May leaving their old site to be developed for housing.
The first officer shouted "look!" as the drone passed next to the right wing at around 11,000ft above south-east London.
They found a sheepish looking ewe with a traffic cone on her head in the middle of a field.