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Clashes in Greece

A demonstrator is detained by riot police during protests in Athens's Syntagma (Constitution) square against planned reforms by Greece's coalition government, February 10, 2012.

Europe's debt crisis

The leaders of eight of the world's biggest economies meet this weekend outside Washington, seeking to keep Europe's debt crisis from spiraling out of control and jeopardizing fledgling recoveries in the U.S. and elsewhere.