WASHINGTON - A member of the US military was killed in a bomb blast in northern Iraq on Thursday, officials said, as Iraqi forces in the region continued their push on Mosul. "A US service member died from wounds sustained in an improvised explosive device blast in northern Iraq ," Pentagon officials and the US-led coalition fighting the Islamic State group said. They did not immediately identify the service member, or say whether he or she was one of the more than 100 US troops advising Iraqi security forces and Kurdish peshmerga as they push toward the IS-held city of Mosul on multiple fronts.