Moroccan runner Mariem Alaoui Selsouli was suspended from the London Olympics on Wednesday after testing positive for furosemide, a banned substance, at a competition in Paris earlier this month.

A contender in the women's 1,500-meter race, the 28-year-old Selsouli ran a personal best 56.15 seconds at the event on July 6.

Furosemide is a diuretic that can be used to mask the presence of other performance-enhancing drugs. According to Sporting Life, Selsouli served a two-year suspension from 2009-11 for blood-doping and could face a lifetime ban from the International Association of Athletics Federations if found guilty of the second offense.

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