NEW : Car bomb kills 5 in Basra . Blasts occur in Shiite areas of Baghdad and Najaf . Many of the victims are Iranian pilgrims , an official said . And in Baghdad , a bomb wounds 10 people .
NEW : Car bomb kills 5 in Basra . Blasts occur in Shiite cities of Karbala and Najaf . Many of the victims are Iranian pilgrims , an official said . And in Baghdad , a bomb wounds four people .