At least 16 people are deadfollowing mortar shellingupon houses in Iraq's restive western city of Fallujah, dpa cited a hospitalofficial as saying.Fifteen are reported wounded after shelling that hit severaldistricts of Fallujah, the scene of fighting between governmenttroops and militant insurgents since January, Ahmed al-Shami,spokesman for the Fallujah Hospital, told news website alsumariaNews.