BAGHDAD (AP) — Officials say a bomb has hit a procession of Shiite pilgrims in Iraq's capital, killing at least two people. The blast comes days after another attack killed seven

on the annual pilgrimage honoring a revered imam.

A police officer and a health worker say Tuesday night's bomb hit devotees marching in Baghdad's southern Saydiyah neighborhood. They were headed to a famed shrine to commemorate the death of Imam Moussa al-Kadhim. Both officials spoke on condition of anonymity because they were not authorized to release the information.

The bomb struck despite heightened security after a mortar attack Sunday killed seven other pilgrims.

Violence during the pilgrimage, which climaxes Saturday, has raised fears of further heightening tensions between Shiite and Sunni Muslims during a sectarian-fueled deadlock in Iraq's coalition government.