NEW : The attacks targeted Shiite civilians , security forces . Falluja 's mayor was shot to death while visiting a sewage plant . Adnan al-Jalbawi , Falluja 's mayor for the past three years , died in a burst of gunfire while visiting a sewage pumping station , police officials in Anbar province reported . Bombings in Falluja , Baghdad and Baquba kill hundreds more . Nearly 6,000 people have been killed in attacks across Iraq this year , the U.N. says .
NEW : The attacks targeted Shiite civilians , security forces . Falluja 's mayor was shot to death while visiting a sewage plant . Bombings in Falluja , Baghdad and Baquba kill hundreds more . Nearly 6,000 people have been killed in attacks across Iraq this year , the U.N. says .