The BBC has launched an investigation into alleged drug use by two Strictly Come Dancing stars, it has been reported.

The Sun on Sunday claimed that the cocaine use by the stars - who have not been named - was widely talked about on the show.

It added that the corporation had hired law firm Pinsent Masons to lead the probe.

The BBC said it had "clear protocols and policies in place" for dealing with any serious complaints raised with it.

According to the newspaper, the claims of alleged drug use were made in a legal submission to the BBC in March by law firm Russells on behalf of a former celebrity contestant.