Officers at a prison in Northeast China have denied that one of their prisoners had sex with a policeman's wife while serving a sentence, according to media reports.

Nehe Prison in Nehe, Heilongjiang province, did not submit video records to a team dispatched by the Heilongjiang provincial authority, saying that it could not find them, China Central Television reported on Friday.

A preliminary investigation showed that the prisoner, surnamed Wang, used a mobile phone to chat with a number of women, and two of the women gave Wang mobile phones after paying 200 yuan ($32) to a police officer.