ROME, July 15 (Xinhua) -- Italian police raided the hotel where Jamaican sprinters Asafa Powell and Sherone Simpson were staying and found unknown substances on Monday.

Powell and Simpson, who admitted Sunday that they tested positive for banned stimulant oxilofrine, were among five Jamaican athletes testing positive.

According to the Associated Press, police searched rooms of the athletes and physical trainer Christopher Xuereb of Canada and confiscated drugs and muscle supplements.

Police said it was unclear if the drugs and muscle supplements were legal or illicit and that the substances were being analyzed.