A Royal Canadian mounted police officer stands guard as Britain's Prime Minister David Cameron, not seen, and his delegation arrives in Toronto, Canada, Thursday, June 24, 2010, to attend the G8 and the G20 meetings. (AP Photo/Lefteris Pitarakis)

Photo by: Lefteris Pitarakis

A Royal Canadian mounted police officer stands guard as Britain's Prime Minister David Cameron, not seen, and his delegation arrives in Toronto, Canada, Thursday, June 24, 2010, to attend the G8 and the G20 meetings. (AP Photo/Lefteris Pitarakis)