US combat troops in Iraq fall below Obama's 50,000 mark

US troop numbers in Iraq fell below 50,000 on Tuesday, a week ahead of an official end to America's combat mission, as a poll cast doubt on the timing of the pullout and warned of negative consequences. The news comes as a spike in unrest over the past two months has triggered concern that Iraqi forces are not yet ready to handle security on their own, and with no new government formed in Baghdad since a March 7 general election. Duration: 00:50.