Police fired teargas against protesters clamoring for the Argentine president's resignation outside his palace on Thursday. Days of rioting over austerity measures left 16 dead and forced the economy minister to quit. As the country grappled with its worst crisis in decades, about 4,000 protesters angry at wage and pension cuts to pay off public debt thronged historic Plaza de Mayo near the presidential palace. Police with special powers of arrest after a state of siege was decreed fought them with tear gas.