(CNN) -- New details fueled debate Monday over security at the upcoming Winter Olympic Games in Sochi: Wanted posters of a terrorism suspect on the loose, warships at the ready and a video threat from beyond the grave.
Russian President Vladimir Putin stressed that his country has stepped up security and is prepared to handle any threats.
But some U.S. lawmakers -- and at least one Olympic athlete -- have said they're worried about the situation.
Hotels warned about terror suspect
Police in Sochi have handed out fliers at area hotels warning of a woman they believe could be a terrorist and who may currently be in the city.
One flier, obtained by CNN, asks workers to be on the lookout for Ruzanna "Salima" Ibragimova, described as the widow of a member of a militant group from the Caucasus region.
The woman, according to the flier, may be involved in organizing "a terrorist act within the 2014 Olympic region."
Photos of Ibragimova have flooded television and social media reports from Sochi. Some describe her as a "black widow" -- a notorious type of terrorist that's emerged in Russia's clashes with Chechen separatists.
Many of them are wives of insurgents killed by government forces, and they've been blamed for high-profile suicide bombings.
Security experts stressed Monday that the woman is likely one of many suspects authorities are trying to find.
"I guarantee they're talking about this one black widow," former CIA officer Mike Baker said, "but there are others that they're also worried about."
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