Moroccan 1500m runner and Olympic hopeful Amine Laalou will miss the London Games after the IAAF alerted the International Olympic Committee (IOC) to a report he may have returned a positive dope test.

An informed source told AFP on Friday that Laalou had taken a "banned substance" at a meeting in Monaco on July 20, where he came in fourth in a time of 3:30.54.

"The Moroccan athlete has not been authorised to enter Great Britain - English police expelled him at the airport in London," Moroccan sports radio MARS reported.

"Amine Laalou is suspected of doping - he will not line up for the 1500m," a member of the Moroccan delegation at the Games said.

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