Greek debt crisis looms over G7 summit in Germany

Flaring tensions between Greece and its creditors were set to dominate a G7 summit in Germany on Sunday, amid fears the debt-wracked country could crash out of the euro and rock the world economy. German Chancellor Angela Merkel, a champion of tough eurozone reform and austerity, will host the other leaders of the Group of Seven industrialised democracies -- the United States, Britain, France, Italy, Canada and Japan. Also at the two-day power meet will be Greece's international creditors -