Al-Qaeda underwear bomber 'was double agent'
Reports from the US say the would-be suicide attacker in a foiled "underwear bomb" plot was in fact a double agent.
US officials are quoted as saying that the person dispatched by Yemen-based al-Qaeda to attack a US-bound plane had infiltrated the group.
In an apparent intelligence coup, the agent left Yemen with the device and delivered it to the CIA.
Emily Buchanan reports.