NEW : Pilgrims are also targeted in the Sunni heartland . Two bombs explode in Baghdad . Two more explode in northern Sadr City Shiite area . Al-Hashimi said al-Maliki 's charges against him were politically motivated and fled to the semi-autonomous Kurdish region . Fears intensify over Shiite -Shiite sectarian violence .
NEW : Pilgrims are also targeted in the Sunni heartland . Two bombs explode in Baghdad . Two more explode in northern Sadr City Shiite area . Fears intensify over Shiite -Shiite sectarian violence .