The following statement has been released on behalf of the family of Pc Keith Blakelock.
"The family of PC Keith Blakelock have never given up hope in getting justice for him. We welcome this news, and extend our eternal gratitude to the Metropolitan Police Service."
More top news
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.