(NBC NEWS) Agents of the U.S. Transportation Security Administration will be stationed at British airports during the Summer Olympic Games, British media reported Tuesday — the latest indication that authorities are scrambling to shore up security before the games open in 11 days.

M. Alex Johnson is a breaking news and projects reporter for NBCNews.com. Follow him on Twitter andFacebook.

Sky News, citing security sources, reported that the agents would begin arriving at Heathrow and other major UK airports next week.

Olympic organizers have come under withering criticism after G4S, the private contractor coordinating security preparations, said last week that it might not be able to supply enough guards. In response, the British military was asked to provide 3,500 extra personnel last week, government sources told NBC News.

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