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Mexican officials said Sunday that a truck carrying potentially dangerous radioactive material had been stolen. The radioactive iridium-192 “can be dangerous for people if not handled safely,” officials said. It could cause “permanent or serious injury to a person who is handling or in contact with it for a short time.” Several states were put on alert after the material went missing. Officials said the thieves may not have been aware of what they were stealing and may have instead been interested in other goods.