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Sochi: Six countries receive false terrorism threat ahead of Olympics

The recent threats compounded fears that Islamist militants may attack the Winter Olympics, which will take place in Sochi, Russia. The country has strengthened security ahead of the games.

At least five European countries' Olympic committees and the聽United States聽received letters in Russian on Wednesday making a "terrorist threat" before the聽Sochi聽Games, but Olympic chiefs said they posed no danger.

Despite the assurances, the letters to committees in Italy, Hungary, Germany, Slovenia and Slovakia briefly caused alarm and underlined nervousness about security at the $50 billion event on which Russian President Vladimir Putin's legacy may depend.

罢丑别听U.S. Olympic Committee聽later confirmed that it also received a letter by email.

Suicide bombers killed at least 34 people in a city in聽southern Russia聽last month, Islamist militants have threatened to attack the Winter Games and security forces are hunting a woman suspected of planning a suicide bombing and of being in Sochi already.

"I am very pleased to inform everyone that both the IOC and the聽Sochi聽organising committee ... declared after the analysis of the letter that this threat is not real,"聽Zsigmond Nagy, director of international relations at the Hungarian Olympic Committee, told Reuters.

He said "this person has been sending all kinds of messages to many members of the Olympic family."

The letter, he said, threatened Hungarian nationals, competitors and officials, saying that "persons attending the Olympic Games might be blown up."

Nagy also quoted IOC officials saying the letters had been sent by someone living outside聽Russia聽who had carried out such hoaxes before, but did not identify the person. He said there was "nothing to worry about."

In addition to聽Hungary聽and the聽United States,聽Italy,聽Germany,聽Slovakia聽and聽Slovenia聽said their national committees also had received threats and all had passed them to police.

"We have received the email in question and we have forwarded the message to the appropriate authorities," U.S. Olympic Committee CEO聽Scott Blackmun聽told Reuters. "The safety and security of Team USA is our top priority."

The committee is working with the U.S. State Department, local organizers and law enforcement to protect the U.S. delegation and other Americans traveling to聽Sochi, he said.

Earlier on Wednesday, U.S. lawmaker聽Michael McCaul, chairman of the聽House of Representatives' Homeland Security Committee聽who recently toured聽Sochi, told CNN he had not heard of any threats against the U.S. Olympic team.

"Not to the U.S. Olympic team," he said from聽Moscow. "There are threats. I can't go specifically into these, but not to the American team."

The IOC, which is based in聽Switzerland, moved quickly to ease concern after the first of the letters was received in Budapest. It said it took security very seriously and passed on any credible information to the relevant security services.

"However, in this case it seems like the email sent to the聽Hungarian Olympic Committee聽contains no threat and appears to be a random message from a member of the public," it said.

Russia on high alert聽

The IOC has said it is confident that the games, opening in聽Sochi聽on the shores of the聽Black Sea聽on Feb. 7, will be safe, and Putin has put about 37,000 security personnel on combat alert in the聽Black Sea聽resort and increased security nationwide.

Russia聽also has been discussing its security operation with the聽United States, and Putin, who has played a big role in winning and organising the games, spoke about security at聽Sochi聽with U.S. President聽Barack Obama聽by telephone on Tuesday.

Even so,聽Moscow聽has failed to dampen concern that it will be able to guarantee visitors' and competitors' safety, despite the most elaborate security preparations for an Olympics.

A militant leader,聽Doku Umarov, has called for insurgents fighting for an Islamist state in聽Russia's聽North Caucasus聽to attack聽Sochi聽- which lies on the western edge of the Caucasus mountains where the insurgency is focused.

Security concerns were heightened by the suicide bombings last month in聽Volgograd, a southern Russian city that serves as a gateway to the聽North Caucasus, and by a video in which the Islamist militant group which claimed responsibility for the attacks threatened more violence.

In聽Sochi, which plans to host hundreds of thousands of visitors during the games, security forces are searching for a woman called聽Ruzanna Ibragimova, 23, who they suspect may be planning a suicide attack.

She may have arrived in the Olympic host city on Jan. 11-12, a letter seen by Reuters said.

"(She) may be used as a terrorist-suicide bomber by (insurgency) leaders to organise terrorist acts during preparations for and during the 2014 Winter Olympics," read the letter, asking police to look immediately into the matter.

The letter from聽Russia's Federal Security Services to local police said she was the widow of a slain Islamist militant and is believed to have recently left her home in Dagestan, in the turbulent, mainly Muslim聽North Caucasus.

Photographs of Ibragimova show a woman in a hijab, wearing a long dress.

Some Russian media say Russian forces may also be looking for other would-be suicide bombers known as "Black Widows", but the reports have not been confirmed.

(Additional reporting by Karolos Grohmann, Thorsten Severin, Naomi O'Leary, Noah Barkin, Annika Breidthardt, Almir Demirovic, Susan Heavey and Eric Beech; Writing by Timothy Heritage; Editing by Mike Collett-White, Bill Trott and Meredith Mazzilli)