US troops called in as Iraqi army base attacked

US troops have been called in to help Iraqi forces battle insurgents who attacked an army base in Baghdad, killing 12 people, officials say. It marks the first such use of US troops since the end of US combat operations five days ago. US forces remaining in Iraq can now participate in operations only at the request of Iraqi authorities. A US military spokesman said US forces had provide fired as Iraqis located two of the assailants inside the base. The BBC's Gabriel Gatehouse in Baghdad says reports from the scene are still confused, but piecing together events from different sources, the attack seems to have involved at least five bombers. He says one of the bombers detonated his explosives at an outer checkpoint leading to the Rusafa military command headquarters, blowing up a minivan.