NEW : Among those killed were six soldiers who died in a suicide car bombing that targeted a military post , the police officials said . A curfew has been imposed in Baghdad until further notice , police say . al-Alwani , a prominent Shiite politician , is arrested in a raid on his home . He waged a campaign against the Sunni prime minister 's government , calling it sectarian . The government issued an arrest warrant for Ahmed al-Alwani for allegedly inciting sectarian strife .
NEW : A curfew has been imposed in Baghdad until further notice , police say . al-Alwani , a prominent Shiite politician , is arrested in a raid on his home . He waged a campaign against the Sunni prime minister 's government , calling it sectarian . The government issued an arrest warrant for Ahmed al-Alwani for allegedly inciting sectarian strife .