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Hundreds of people from a left-wing political party marched through Kabul to protest U.S. military operations and demanded the withdrawal of foreign troops.

They chanted, “Death to America, death to the American government,” and carried pictures of Afghans killed or wounded in recent airstrikes. They burned an effigy of Mr. Obama.

Violence has been on the rise in eastern Afghanistan and earlier in the day a roadside bomb killed 12 civilians, including five children, in Paktika province.

A spokesman for the governor of the province, Mokhlis Afghan, said another five people were wounded when the bomb planted by insurgents exploded next to a truck carrying civilians.

Paktika borders Pakistan’s lawless tribal areas, used as safe havens by insurgents fighting U.S.-led coalition troops in Afghanistan. Insurgents regularly cross the rugged frontier to attack coalition forces and the region has seen an increase in fighting, as well as a rise in casualties.