The International Association of Athletics Federations (IAAF) is awaiting confirmation from Jamaica's Amateur Athletics Association (JAAA) that five of its athletes have been cleared of drug offences allegedly committed at the national trials in June.

Yohan Blake, Marvin Anderson, Allodin Fothergill and Lansford Spence were cleared by a disciplinary committee on Monday formed by Jamaica's Anti-Doping Commission (JADCO), joining Sheri-Ann Brooks whose case was thrown out last week after a procedural error in the testing of her 'B' sample.

The disciplinary committee took the decision to announce their clearance on the basis that the substance methylxanthine was not on the World Anti-Doping Agency (WADA) banned list, although that is being challenged.

JADCO itself, as an independent organisation and a signatory of the WADA code, is not supportive of the findings of its own disciplinary panel which was appointed by the country's sports minister.

JADCO's appeal will be based on evidence that methylxanthine contains a similar structure to tuaminoheptane which is listed as a stimulant in the WADA list of unauthorised substances.

The IAAF has still to receive the official findings from the JAAA before it can either confirm or question the findings.

An IAAF spokesman said today that when these are submitted, it will be considered by its medical and anti-doping commission who will make recommendations to its council which is meeting in Berlin this week.

Should there be disagreement with the JAAA submission, the IAAF will almost certainly refer the matter to the Court of Arbitration for Sport (CAS) and temporarily suspend the athletes until a binding decision is made.

That procedure would see all five athletes prevented from competing at the World Championships beginning in Berlin on Saturday.

Jamaica's Anti-Doping Commission (JADCO) issued a statement in which it stressed that it operated independently of the disciplinary committee and "in light of the decision of the disciplinary panel", it would "enforce its rights by virtue of Section 21 of the Anti-Doping in Sport Act, 2008 and appeal the decision".

The statement, released in the Jamaica Observer, added: "All signatories to the code must adhere to the list of prohibited substances and methods issued by WADA each year and in this instance the list which came into effect on 1 January 2009.

"All four athletes were found with 4-Mehtly-2 Hexanamine in their urine samples which was reported as an Adverse Analytical Finding by the WADA accredited laboratory in Montreal, Canada, and that this substance is considered by WADA as being of similar chemical structure to Tuaminoheptane, which is listed as an example of a stimulant in the WADA 2009 prohibited list international standard."