MEXICO CITY (AP) — Mexico's nuclear safety director says workers have succeeded in safely removing a shipment of radioactive cobalt-60 that had sat in a cornfield for almost a week after being abandoned by thieves.

Juan Eibenschutz says a robot completed scooping up the dangerous material Tuesday evening. He says the cobalt-60 was put in a safe container and is now being transported to a nuclear waste treatment facility.

The cobalt-60 was being carried in a truck that was stolen in central Mexico on Dec. 2.

Authorities found the truck two days later with the shipping container empty. The radioactive material was then tracked down to the field near the truck.

Five people are being held as suspects in the case.

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  • A police agent stands guard as an ambulance leaves the village of Hueypoxtla, Mexico, Wednesday, Dec. 4, 2013. (AP Photo/Marco Ugarte)

  • This image released Wednesday, Dec. 4, 2013 by the National Commission on Nuclear Safety and Safeguards of Mexico's Energy Secretary (CNSNS) shows a piece of machinery that is part of the cargo of a stolen truck hauling medical equipment with extremely dangerous radioactive material, in Tepojaco, Hidalgo state, north of Mexico City. (AP Photo/CNSNS)

  • This image released by the National Commission on Nuclear Safety and Safeguards of Mexico's Energy Secretary (CNSNS) Wednesday, Dec. 4, 2013, shows a large box that is part of the cargo of a stolen truck hauling medical equipment with extremely dangerous radioactive material, in Tepojaco, Hidalgo state, north of Mexico City. (AP Photo/CNSNS)

  • This image released Wednesday Dec. 4, 2013 by the National Commission on Nuclear Safety and Safeguards of Mexico's Energy Secretary (CNSNS) shows a piece of machinery that is part of the cargo of a stolen truck hauling medical equipment with extremely dangerous radioactive material, in Tepojaco, Hidalgo state, north of Mexico City. (AP Photo/CNSNS)