Police have refused to confirm if an investigation into an alleged sexual assault involving three Brisbane Broncos players has been widened to include drug use.

The Australian newspaper on Thursday reported that video footage on a mobile phone seized from one of three rugby league players allegedly involved in an assault on a woman in a Brisbane nightclub also showed people taking drugs.

The newspaper said the footage was found on one of the player’s mobiles but added that police had yet to determine the identities of those who were believed to have been captured on the video.

A Queensland police spokeswoman said the assault investigation was continuing but would not confirm whether it had been widened to include any drug taking.

A 24-year-old woman alleges she was assaulted by three Broncos players in a toilet at the Alhambra Lounge in the inner Brisbane suburb of Fortitude Valley on September 13.

The players’ mobile phones were taken by police last week when Karmichael Hunt, Sam Thaiday and Darius Boyd were formally interviewed by police over the assault allegation, The Australian reported.

The newspaper said police were investigating suggestions that various sex acts in the nightclub’s toilets were recorded on a mobile phone, but it was not known when the footage was shot.

Queensland police commissioner Bob Atkinson said investigations into the assault allegation should be completed next week, and police may ask for a second opinion from the Director of Public Prosecutions.