BILL COSBY HAS refused to answer questions about rape allegations against him in an interview with a US radio station.

For several years Cosby has been the subject of a number of allegations of assault from women.

One, Barbara Bowman, wrote in a Washington Post article this week that she was drugged and then raped as a teenager. She has spoken out repeatedly about the incident.

In 2006 Cosby settled out of court with Andrea Constand, who claimed that he had assaulted her two years previously. Thirteen other women, including Bowman, were willing to testify in that trial.

Comedian Hannibal Buress brought the allegations to the fore again last month during a stand up routine, and a video of the set was widely circulated online.

Cosby has attempted to dodge questions and distract from the issue over the past few weeks. Last week an attempt to instigate a humorous meme experiment from his Twitter account went horribly wrong.

His upcoming appearance on The Late Show With David Letterman has been cancelled amid the growing uproar about the allegations.

When asked by NPR host Scott Simon about the claims in an interview broadcast today, Cosby stayed silent, refusing the opportunity to have his say.

Scott indicates that he was “shaking his head no” after asking him about “serious allegations raised about you in recent days”.

Cosby’s wife Camille was also present for the interview, which has been organised for the couple to discuss their philanthropic work and donations of art to the Smithsonian.

Here’s why Bill Cosby’s meme experiment went horribly awry>