The gang in the northeastern city of Suihua planned to scam as many officials as possible, but made just one attempt before apparently losing their nerve, the Legal Daily reported.
After snatching Zhang Wei, a manager in the city Agriculture Department, and his wife from their home, they blindfolded them, drove them to the interrogation room and obtained a promise of a 400,000 yuan (USD 63,000) payment after several hours of questioning.
An official with the city Agriculture Department's security bureau confirmed the report but declined to provide other details.
The interrogation room, complete with furniture, computers, cameras and official seals on the wall, was built by the four in an abandoned shopping center at a cost of 200,000 yuan (USD 32,000), the Legal Daily reported.
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According to the newspaper, Zhang said he'd done nothing wrong but agreed to make the payment to "ensure his own personal safety."
Thousands of officials have been questioned and more than 100 high-ranking bureaucrats and military officers have been charged in a sweeping anti-graft campaign launched two years ago by President Xi Jinping.