Federal law enforcement investigators are searching in at least three states for more than 500 pounds of explosives stolen from a CSX train, CBS News has learned. CBS News Justice Department and Homeland Security correspondent Jeff Pegues reported a law enforcement source says the amount stolen has authorities concerned that the explosives could fall into the wrong hands.

Sources say the theft was reported two days ago but the case has not yet gone public. The ATF is considering putting out an advisory and announcing an reward in the coming days. The CSX train was traveling from Chicago through Ohio en route to Detroit. Somewhere along the way, investigators believe the explosives were stolen. FULL REPORT