(ap) olice and soldiers clashed with thousands of protesters outside Honduras' national palace Monday, leaving at least 15 people injured, as world leaders from Barack Obama to Hugo Chavez demanded the return of a president ousted in a military coup. Leftist leaders pulled their ambassadors from Honduras and Nicaraguan President Daniel Ortega said El Salvador, Nicaragua and Guatemala would cut trade with neighboring Honduras for at least 48 hours. Venezuelan President Hugo Chavez called for Hondurans to rise up against those who toppled his ally, Manuel Zelaya. "We're ready to support the rebellion of the Honduran people," Chavez said. He did not say what kind of support he was offering. Protests outside the presidential palace grew from hundreds to thousands, and soldiers and police advanced behind riot shields, using tear gas to scatter the protesters. The demonstrators, many of them choking on the gas, hurled rocks and bottles as they retreated. At least 38 protesters were detained, according to human rights prosecutor Sandra Ponce.