A man accused of threatening to post doctored nude photos of a female student if she did not have sex with him, is now behind bars.

The St Andrew Central police reported that the 24-year-old man met the 17-year-old girl about two weeks ago in an online chat site. His identification is being withheld pending investigations.

Reports say the two then began to communicate by telephone during which the man allegedly began demanding sex.

The police were then called in by the female after the man reportedly threatened to doctor pictures of her and post them on the Internet if she failed to comply with his demand for sex.

Further reports are that the police then set up a sting operation and instructed the young girl to meet the suspect in the Half-Way Tree area. She then arranged the meeting between him and her on Friday afternoon and the man was subsequently held by the police around 2:45 p.m.

The police also reportedly seized a laptop computer which was in his possession.

According to the Centre for the Investigation of Sexual Offences and Child Abuse which has become part of the probe into the case, the man's computer is now in the hands of investigators from the Organised Crime Investigation Division who will be seeking evidence from it.