'Black widow' suicide bombers threaten Sochi Games His baby: Russian President Vladimir Putin speaks to Olympic volunteers in Sochi, Russia. Washington: A possible female suicide bomber may have already made it past the ring of security for the Sochi Olympic Games, according to reports from America's ABC News and NBC News. Russian security services may be looking for as many as four "black widows" who have been dispatched to disrupt the Olympics, NBC News reported on Monday. The suspected terrorist who may be inside the security ring is believed to be a young widow of an Islamic militant killed by Russian security forces last year. She is described as being affiliated with the Caucasus Emirate, the terror group led by Doku Umarov that has threatened attacks against next month's Winter Games in Sochi. Threatening the Sochi Olympics ... in online video footage, two men from Islamist militant group Vilayat Dagestan claim responsibility for two suicide bombings that killed at least 34 people last month in the Russian city of Volgograd. Wanted posters describe the woman as having a limp in her right leg, a left arm that does not bend at the elbow and a 10-centimetre scar on her cheek. The notices say that Russian security officials have been informed of her possible departure from Dagestan earlier this month. Militant groups in the Caucasus are known to use "black widows," considered by security experts to be harder to identify because they do not fit the stereotype of an Islamic militant and can easily change their appearance with clothing and make-up. Russian authorities are primarily responsible for security at the Games, although the US government provides additional security for the Olympic delegation. About 40,000 Russian police and military personnel have been dispatched to the region. In Sochi, the Olympic Park on the coastal cluster includes venues for ice sports such as figure skating, hockey, speedskating and curling. It is surrounded by a heavy security ring, as has been the practice for past Games. A day earlier, concerns raised by members of Congress about the safety of Americans at the Sochi Olympics and the release of a video by two purported suicide bombers underscored the terror threat Russia faces as it prepares to host the Winter Games in 17 days. An Islamic militant group in the volatile Caucasus region threatened to attack the Games and claimed responsibility on Sunday for two bombings last month in the southern city of Volgograd that killed 34 people. It wasn't immediately clear whether the boasts of the two men represented a credible threat to the Games, a federal law enforcement official said. The official said there was no definitive evidence to indicate whether the two men pictured in the video were linked to the Volgograd bombings. Meanwhile, the US has said it is ready to deploy air and naval assets - including two ships - to help secure the Games. Rear Admiral John Kirby said on Monday: "Air and naval assets, to include two navy ships in the Black Sea, will be available if requested for all manner of contingencies in support of - and in consultation with - the Russian government." US Representative Michael McCaul said he planned to be in Sochi on Tuesday to assess the security situation. All the briefings that I've received, from the intelligence community to the FBI and others, indicate that there are serious concerns, and that we need to do a lot to step up security. I do believe [Vladimir] Putin is doing a lot of that," said Mr McCaul, chairman of the House Homeland Security Committee, on ABC's This Week. The State Department has advised Americans attending the Games to keep vigilant about security because of potential terrorist threats and crime. Last week Chechen leader Ramzan Kadyrov said Umarov had died. He had no proof of Umarov's death but said the information was obtained through communications between other rebel leaders. In the aftermath of the bombings, some American athletes said they had full confidence in the host country's security measures. Putin is not going to compromise security. This is his baby," speedskater Patrick Meek said. USA Today, AFP, Bloomberg,