WASHINGTON (AP) - The chairman of the House Homeland Security Committee says safety measures undertaken by the Russian government at the Sochi site of the Olympics are the "most impressive" in the history of the Games.

But Texas Republican Rep. Michael McCaul says he remains concerned about the possibility of an attack at the Games, which commence on Feb. 7.

McCaul tells CNN Wednesday he believes improvement is needed in intelligence-sharing between Russia and the United States. And he voices concern about the risk of a suicide bomber setting off an explosive device.

McCaul visited the site last week. He calls it "quite fortified" but says that "it only takes one suicide bomber to get in."

He says, "I would hope the president of Russia would allow us to come in and help."

Hungary's Olympic Committee on Wednesday announced it and other nations have received an email message written in Russian and English threatening their athletes with terrorist attacks at the upcoming Sochi Olympic Games.

Hungary's secretary general tells the sports daily Nemzeti Sport that the message also urges the Hungarian delegation to stay away from the Winter Games, which run from Feb. 7-23.

Hungary's Olympic Committee president says the threat is being taken seriously and the International Olympic Committee, the Sochi organizers, and Hungarian security forces have been informed.

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