Source: Feds investigating leak in Al Qaeda bomb plot

Federal investigators are conducting a probe into who leaked information about an al-Qaida plot in which an explosive device was to have been detonated on a U.S.-bound airline flight, a law enforcement official said Wednesday.

The official spoke on condition of anonymity about the leak investigation, which is just getting under way.

The federal investigation is the latest move in an aggressive campaign by the Obama administration to crack down on leaks, even as it has supported proposed legislation that would shield reporters from having to identify their sources. The administration has already brought at least six criminal cases against people for discussing government secrets with reporters, more than under any previous presidency.