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. 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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Fake Penguins Jerseys . -- The Chicago Bears agreed Tuesday to a one-year contract with defensive lineman Israel Idonije and are bringing him back for a second stint. MINNEAPOLIS -- The Minnesota Vikings have moved into the home stretch of their search for a head coach and Cincinnati defensive co-ordinator Mike Zimmer has emerged as a favourite. John Wooten, the executive director of the Fritz Pollard Alliance, said in a phone interview on Monday that Vikings general manager Rick Spielman told him last week the teams plan was to contact finalists for the job by Tuesday. According to an NFL Network report on Saturday, Zimmer was scheduled to travel to Minnesota on Monday and meet with Vikings officials for a second interview Tuesday. The alliance, based in Washington, is designed to promote candidate development for coaching, front office and scouting jobs in the NFL. The FPAs strategic efforts include advocacy for and marketing of the hiring and promotion of minorities among NFL teams, and one of Wootens protegees is Arizona defensive co-ordinator Todd Bowles, another strong candidate for Minnesota. Bowles spoke with Spielman in Arizona last week, and Wooten said Spielman told him the interview went well. "He was thoroughly, thoroughly impressed. Thats the way I would describe it," Wooten said. Wooten said on Monday afternoon that he had not yet heard from Spielman about a second interview for Bowles. The Vikings began the week one of four teams left without a head coach, joining Cleveland, Detroit and Tennessee. The Lions, according to Wootens conversation with general manager Martin Mayhew, were also moving toward a concclusion, with a similar plan to invite finalists to Michigan on Monday or Tuesday for further talks with team brass.dddddddddddd Another candidate working with Wooten is former Indianapolis coach and current Baltimore offensive co-ordinator Jim Caldwell, who has previously interviewed with the Lions. "We think that Jim is right in the thick of this thing," Wooten said. One of Spielmans favourite terms is "due diligence." His public declaration when the process began was that he wouldnt let a particular category, circumstance or deadline limit his options for Leslie Fraziers successor. Spielman, though, said his preference was to make the hire prior to the Senior Bowl, a prime period of draft prospect evaluation for coaching staffs around the league. Practices for the annual college all-star game in Mobile, Ala., begin next week. The Vikings arent publicizing any information about the search. Zimmers agent, David Dunn, didnt immediately return messages left on Monday. Theyve already interviewed, according to various reports: Seattle offensive co-ordinator Darrell Bevell, Seattle defensive co-ordinator Dan Quinn, Cleveland defensive co-ordinator Ray Horton, San Francisco offensive co-ordinator Greg Roman and San Francisco defensive line coach Jim Tomsula, in addition to Bowles and Zimmer. With the Seahawks and 49ers playing this Sunday for the NFC championship, the Vikings couldnt talk to any of those four candidates again until next week. ' ' '