NEW : A curfew has been imposed in Ramadi until further notice , police say . Ahmed al-Alwani , a prominent Sunni politician , is arrested in a raid on his home . Comment: The government issued an arrest warrant for al-Alwani for allegedly inciting sectarian strife .
NEW : A curfew has been imposed in Ramadi until further notice , police say . Ahmed al-Alwani , a prominent Sunni politician , is arrested in a raid on his home . He waged a campaign against the Shiite prime minister 's government , calling it sectarian . The government issued an arrest warrant for al-Alwani for allegedly inciting sectarian strife .