Transcript for Intense Search Over for Stolen Radioactive Waste as Truck Is Found
come on the air there is a fast moving story that sounds impossible. A truck carrying highly radioactive material was sitting at a gas station in mexico when thieves seized it and drove away. As of this moment the truck has been found and a mexican official says so has the radioactive material. Let's get the latest from pierre thomas. Reporter: The truck has been found with at least some of that extremely dangerous material. Tonight customs officers at the southern border are at heightened alter, concerned about highly radioactive material stolen in mexico. This medical device, used in the treatment of cancer patients, has been missing for two day. Inside it, cobalt 60, a radioactive material described by authorities as "extremely dangerous," potentially lethal. The device was stored in a truck that was stolen on its way from tijuana to a radioactive waste storage facility not far from mexico city. On monday at 2:00 a.M., Two armed men confronted the drivers at a remote gas station. The gunmen then took off with the truck and its cargo. Authorities don't know who they are or if they even knew the radioactive material was on board. You could get a lethal dose in just a few minutes from being exposed to this source. Reporter: U.S. Officials have been long worried that stolen radioactive material could be used to make a so-called dirty bomb. The material in the stolen truck, combined with a conventional explosive, could -- this is material that could be used, if used properly, in a very dangerous dirty bomb. They need to know how to handle the material without giving them incapacitating doses. Reporter: Part of the reason why there are radio detention devices at the border. Large drive through scanners and portable scanners worn by customs officials. According to a study, half a billion tons of radioactive materials are transported in the u.S. Each year, the overwhelming majority by truck. The mexican truck had a tracker but it was not activated at the time of theft. Mexican authorities say the container was found open with 40 grams of radioactive material sound miles away. Someone may have gotten a lethal dose of radiation. It's clear they didn't know what they had and that may prove deadly. Thank you, pierre. And we move next tonight to the arctic blast, half of
This transcript has been automatically generated and may not be 100% accurate.