LONDON >> American judo fighter Nick Delpopolo was expelled from the Olympic Games today after testing positive for marijuana he said he ate accidentally before arriving in London.

Delpopolo is the first of the 10,500 games athletes to fail an in-competition doping test.

His case is the fifth positive test for a banned substance reported by the IOC since its official London Games testing period began in mid-July. The other four athletes were caught before competing.

The International Olympic Committee said it disqualified Delpopolo from the men’s 73-kilogram class, where he placed seventh.

Delpopolo, 23, tested positive for metabolites of cannabis after competing on July 30.

He apologized to the United States team in a statement acknowledging he was “embarrassed by this mistake.”

“My positive test was caused by my inadvertent consumption of food that I did not realize had been baked with marijuana, before I left for the Olympic Games,” Delpopolo said in a statement released by the U.S. Olympic Committee.

“I look forward to representing my country in the future, and will rededicate myself to being the best judo athlete that I can be,” he said.

Delpopolo “shall have his Olympic identity and accreditation card canceled and withdrawn immediately,” the IOC said.

USOC spokesman Patrick Sandusky said the team was “absolutely committed to clean competition” and supported Delpopolo’s disqualification.

“Any positive test, for any banned substance, comes with the appropriate consequences,” Sandusky said.