The updated alert was issued as the Olympic Games began in Sochi on Friday.
Rep. William Keating urged Americans in Sochi not to run afoul of Russia's anti-gay laws.
The warning comes after two suicide bombings occurred last month in the city of Volgograd.
Rep. Ruppersberger (D-Md.) hopes Putin won't get in the way of proper security.
Mike Morrell said he'd worry about hotels and airports away from Sochi.