Middle-distance runner Amine Laalou has become the second Moroccan athlete to face an Olympic suspension for doping.
Deputy secretary of the Moroccan athletics federation, Mohammed Nouri, confirmed the suspension.
Early reports suggest that the 1,500m runner tested positive for furosemide at a Monaco grand prix meeting.
Fellow Moroccan runner Mariem Alaoui Selsouli had already been sent home for a positive drugs test.