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. Cameron steps into a potential hornets' nest of trans-Atlantic conflict when he makes his global debut this week at the G-20 summit in Canada, with tensions over Afghanistan, Europe's debt crisis and the BP oil spill gaining in intensity. (AP Photo/Lefteris Pitarakis)
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