A stolen truck shipment of radioactive cobalt-60 was found December 4, 2013 following a two-day manhunt in central Mexico.
Mexican authorities say the cobalt-60 was for use in radiotherapy medical equipment. Direct contact with the material, which was sealed in the back of the truck, could prove fatal within minutes.
Authorities do not know the whereabouts of the carjackers.
Panic spread across Mexico as many feared the radioactive material would be used to construct a dirty bomb.
It is believed that the thieves were after the vehicle and its crane, and may have been unaware of the hazardous cargo.