First US soldier killed in Iraq since withdrawal of combat troops

The announcement came amid growing concern that the withdrawal of combat forces will allow security in Iraq to further deteriorate. The past three months have seen a spate of bombings and shootings in the centre and north of the country .

Details of the incident were not released, but Basra airport base, which is still home to about 4,000 US forces, had experienced increased numbers of rocket attacks in recent weeks as the deadline drew near for the withdrawal of combat troops. Two soldiers suffered minor wounds in a rocket strike early last week, and rockets have hit the Green Zone in Baghdad almost daily for the past month.

Around 5,000 US troops will stay in the country until next year, focusing mainly on training Iraqi security forces, but the top US military commander in Iraq said today they could return to combat operations if needed.

General Raymond Odierno told CNN the remaining troops could move back to combat if there was "a complete failure of the security forces", or if political divisions split the Iraqi security forces. "But we don't see that happening," Odierno said.