British Cycling has been accused of hindering and potentially compromising an investigation into Sir Bradley Wiggins, according to reports. The UK Anti-Doping made the claims in a letter sent to British Cycling and Sky last November. The BBC reports that it has access to the damning letter that further hurts the credibility of British Cycling.

UKAD made an inquiry into the case and were particularly critical of the national governing body’s failure to report the allegations of the delivery of a medical package for Wiggins and Team Sky. The allegations started in September 2016 and the Daily Mail reached out to British Cycling who opted not to report the incidence.

The UKAD said British Cycling were “slow to inform” them of the allegations in relation to the 2011 package. The letter stated that as a matter of fact the matter was instigated by UKAD. The anti-doping body said contact by British Cycling before informing them could have potentially comprised their investigation into the matter.

“Under the UK National Anti-Doping policy by which British Cycling is bound, there is an obligation on an NGB (national governing body) of a sport to report an suspicions or allegations of doping. Failure to inform UKAD at the time that individuals within British Cycling became aware of such suspicions or allegations meant that this story had already reached a number of individuals before UKAD was informed, and thus able to act. That only hindered out efforts,” the letter added.

The fact that Doctor Richard Freeman had his laptop stolen and could not keep proper records affected the investigations. The UKAD blasted the medical operation at British Cycling and Team Sky, claiming the medical room at the National Velodrome was “chaotic and disorganized.”

The British Cycling in a statement said they welcomed and accepted any recommendations by the UKAD in the letter they sent upon conclusion of its investigation.