UK PM David Cameron joins other world leaders at the G8 summit for talks set to focus on the eurozone crisis, amid signs a deal is unlikely to be reached.

Greek officials say Germany's Chancellor Merkel has suggested a euro referendum, but Berlin denies the report, as world leaders gather in the US for a G8 summit meeting.

More than 20 monarchs gather to celebrate the Queen's Diamond Jubilee, with protests over the inclusion of the controversial heads of Bahrain and Swaziland.