A border policeman checks a bag at the Sarajevo International Airport in Sarajevo February 26, 2014. U.S. authorities issued a warning last week to airlines flying to the United States to watch out ... more 
A border policeman checks a bag at the Sarajevo International Airport in Sarajevo February 26, 2014. U.S. authorities issued a warning last week to airlines flying to the United States to watch out for militants who may have hidden bombs in their shoes, U.S. government sources said. The warning came from the Department of Homeland Security, the sources said, and it is consistent with concerns security agencies have about militants trying to smuggle explosives onto airplanes in shoes, cosmetics or liquids. REUTERS/Dado Ruvic (BOSNIA AND HERZEGOVINA - Tags: TRANSPORT POLITICS) less 
1 / 6
Reuters | Photo By DADO RUVIC / REUTERS
Wed, Feb 26, 2014 2:08 PM EST