Updated: July 15, 2013, 10:36 AM ET

Associated Press

ROME -- Italian police confiscated unidentified substances Monday in a raid on the hotel where Jamaican sprinters Asafa Powell and Sherone Simpson were staying, after each tested positive for banned stimulants.

Rooms of the athletes and physical trainer Christopher Xuereb of Canada were searched and drugs and supplements were seized, Udine police captain Antonio Pisapia told The Associated Press.

Pisapia said it was unclear if the substances were illegal, and that they were being analyzed.