The World Anti-Doping Agency's (WADA) athletes' committee has called on the organisation to further investigate sports in Russia and other countries outside of athletics.

Beckie Scott, chair of the committee, made the request in a letter to WADA president Craig Reedie.

Russian track and field athletes were banned from international competition by the IAAF last November following allegations of state-sponsored doping in a report from an independent commission established by WADA.

But a documentary by German broadcaster ARD on Sunday claimed anti-doping regulations are still being breached despite the IAAF producing a list of criteria that the All-Russia Athletic Federation (ARAF) must comply with in order to have the ban overturned ahead of the Olympic Games in Rio de Janeiro.

WADA has since expressed its dismay at those allegations while Russian tennis player Maria Sharapova revealed on Monday that she had tested positive for meldonium - added to WADA's list of banned substances in January - during the Australian Open.

The letter from Scott read: "The WADA Athletes' Committee met today in Canmore, Alberta. The most important discussion item for us, as the voice and representatives of clean athletes world-wide, was the request we put forth in November to the WADA Foundation Board: a request to extend the mandate of the Independent Commission.??

"We are of the firm opinion that there needs to be further investigation into other sports in Russia, and other countries identified in the report.

"Since November, we have received many calls and requests from athletes and athlete committees, from many sports, across many nations, for the same. We considered those, and have again reviewed the detailed content of the report issued in November, during an in-camera session.

"Many comments and statements within the report indicate that other sports and countries are implicated, and as such, require further investigation.

"Our view as a committee is that the response to date - to such an evidence-based, incriminating report - has been unsatisfactory, and we wish to express our strong position, once again, in renewing our call for WADA to extend the mandate of the Independent Commission to sports in Russia other than athletics, as well as other countries named in the report.

"WADA states clearly that it supports clean athletes and at the moment, clean athletes are disappointed with the lack of action that has been taken.

"The principles of fair sport are very close to our hearts. We believe that extending the mandate will be a sign of our commitment to clean sport, and a sign that the voice of the clean athlete is being heard."