The former secretary to the head of Russia's prisons service has accused him of sexual harassment and illegally bugging her telephone calls, Russian media reported on Tuesday.

Newspaper Izvestia reported that the unnamed secretary had complained to Russia's investigative committee on sexual harassment about her boss, the head of the Federal Service for the Execution of Punishments, Alexander Reymer.

"I turned him down and afterwards he threatened to throw me out on the street," the newspaper quoted the ex-secretary as saying.

After she rejected several more sexual advances, the prisons boss allegedly showed her printouts of telephone calls that she had made, which she said were acquired through an illegal wiretap, in an attempt to pressurise her.

She said she was forced to resign after two years of alleged harassment and was then evicted from her official apartment, the newspaper reported.

But the Russian investigations committee said in a statement issued after the newspaper published the allegations that it would not be pressing any charges.

The committee said that after investigating, it had "decided not to institute criminal proceedings", without naming Reymer, his accuser or the alleged offences.

The prisons service declined to comment on the case to AFP.