Demonstrators opposed to U.S. President George W. Bush's presence at an Americas summit hurled rocks, ransacked businesses and set fires Friday near the meeting site, triggering clashes with police, reported dpa. Police fired tear gas and rubber bullets against dozens of rioters in this seaside resort, where Bush and 33 other leaders from North and South America met at a hotel to discuss economic policies and poverty. --SP 0009 Local Time 2109 GMT