Three Chinese citizens have been arrested in Georgia’s capital, Tbilisi, while attempting to illegally purchase 2 kilograms (4.4 pounds) of uranium, the country’s State Security Service said Saturday.

The suspects planned to transport the nuclear material to China through Russia, the security service said in a statement, while also releasing video footage of the detention operation.

“Three Chinese citizens have been detained in Tbilisi while attempting to illegally purchase 2 kilograms of nuclear material — uranium,” the agency said, adding that members of the criminal group planned to pay $400,000 (344,000 euros) for the radioactive material.

According to the authorities, a Chinese citizen already in Georgia, who was in breach of Georgian visa regulations, brought experts to Georgia to search for uranium throughout the country.