SOCHI, Russia -- Russian security officials are hunting down three potential female suicide bombers, one of whom is believed to be in Sochi, where the Winter Olympics will begin next month. Cheap Quandre Diggs Jersey . Police leaflets seen by an Associated Press reporter at a central Sochi hotel on Tuesday contain warnings about three potential suicide bombers. A police letter said that one of them, Ruzanna Ibragimova, a 22-year-old widow of an Islamic militant, was at large in Sochi. A U.S. congressman who was in Sochi on Tuesday to assess the situation said he was impressed by the work of Russian security forces but troubled that potential suicide bombers had gotten into the city, despite all of the extraordinary security measures. "We know some of them got through the perimeter," Rep. Michael McCaul, chairman of the U.S. House Homeland Security Committee, told The Associated Press. "Shes for real. What we dont know is how many more black widows are out there." Russian authorities have blamed the so-called "black widows" of slain insurgents for previous suicide attacks in the country. The Black Sea resort town will host the games amid concerns about security and potential terrorist attacks. The southern city of Volgograd was rocked by two suicide bombings in late December, which killed 34 and injured scores more. An Islamic militant group in Dagestan posted a video on Sunday claiming responsibility for the bombings and threatened to strike the games in Sochi, about 500 kilometres (300 miles) west of Dagestan. McCaul, a Republican from Texas, said he had numerous meetings with officials in Moscow and Sochi, and was briefed by the joint operation centre in Sochi, which is responsible for overall security in the area. "The one improvement I would ask of the Russians is to allow our intelligence services to co-ordinate and co-operate better with theirs," McCaul said. Although the Russian side was confident that it could provide security, the U.S. has information that could help keep the games safe, he said. The congressman also expressed concern that terrorists could have gotten into Sochi before security was tightened. "How many potential cells could be in Sochi and the Olympic village?" he said. "But after the ring of steel was implemented we have this one person who seems to have been able to penetrate it. It does demonstrate vulnerability." Police material distributed to the hotel staff included pictures of two other women in veils: 26-year-old Zaira Aliyeva and 34-year-old Dzhannet Tsakhayeva. It said they had been trained "to perpetrate acts of terrorism." It warned that the two women "are probably among us," but, unlike Ibragimovas case, did not say if they are in Sochi. No further information was provided about the two women or their motivation. The term "black widow" refers to the belief that women who have carried out past suicide attacks in Russia did so to avenge the deaths of husbands or other male relatives. Security officials in Sochi were not available for comment on Tuesday. The Olympics are to be held Feb. 7-23. Russia has mounted an intense security operation in the city, but concern persists that "soft targets" outside the Olympic venues, such as buses and tourist facilities, are vulnerable to attack. Russian troops also have been active fighting militants in Dagestan, one of the predominantly Muslim republics in Russias North Caucasus and the centre of an Islamic insurgency that has engulfed the region. On Tuesday, troops shot dead the leader of a militant group, Interior Ministry spokeswoman Fatina Ubaidatova said. She said the militant, Eldar Magatov, was wanted in attacks on security forces, bombings and the extortion of businessmen. 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One of Europes top coaches, Blatt was hired Friday by the Cavaliers, who ended a sweeping, 39-day search with an out-of-the-box selection they hope changes their fortunes.BRASILIA, Brazil - Five-time world player of the year Marta scored three goals to lead Brazil to a 3-2 come-from-behind win over the U.S. womens soccer team in the International Tournament of Brasilia on Sunday.Carli Lloyd and Megan Rapinoe scored a goal each in the first 10 minutes to give the U.S. an early lead, but Marta netted in the 19th, 55th and 66th minutes to guarantee the hosts a spot in the final of the four-team competition.Those early goals could have been costly, we cant let those mistakes happen again, Marta said. Im glad that I was able to take advantage of the chances that I had. It wasnt a good start but we fought hard until the end and got the result that we needed against a very good team.The match brought together Marta and American playmaker Abby Wambach, two of the candidates for this years world player of the year award.It feels good to win a match like this, knowing that I was going against Wambach, Marta said.Brazil reached six points from two matches, while the United States remained on one. China, which routed Argentina 6-0 earlier Sunday, also has four points. Argentina has zero.The top two teams will meet for the title on Dec. 21. The other two nations will play for third place. The U.S. needs to beat Argentina by several goals in the last round onn Wednesday and hope that China loses to Brazil. Cheap Zach Zenner Jersey. Brazil opened with a 4-0 win over Argentina and the U.S. drew China 1-1.The Americans took advantage of Brazils defensive mistakes to take the lead at the Mane Garrincha Stadium in the nations capital. After a corner by Rapinoe from the right side, the ball was headed toward Lloyd in front of the net and she turned for an easy goal in the sixth minute.Rapinoe then found the net with a shot from outside the penalty area in the 10th. She seemed set to make a cross but the ball went straight toward the net, with Brazil goalkeeper Luciana unable to make the stop.Marta put Brazil back in the game after one of her trademark runs through the middle of the defence, entering the area and firing a shot past U.S. goalkeeper Hope Solo.Martas second goal came after she cleared two defenders at the top of the area and fired a left-footed shot into the far corner. The winner was a low shot from outside the area that found the near corner. Solo was near the ball but couldnt make the stop as she dived to her left.The Americans had two great chances to equalize in second-half injury time. 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