Four people were arrested in Ankara after they were found to have a nuclear substance in their car, local media reported. They were aiming to sell the substance for more than $70 million, according to NTV news channel.
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Around 1.4 kilograms of the synthetic radioactive substance californium was found in the car during the raid, according to NTV and the state-run Anadolu Agency.
The raid was conducted by the authorities in Ankara, who were acting on a tip-off.
Californium is used in nuclear reactors. Its name was derived from the University of California, where it was originally synthesized.