"Out of an abundance of caution, DHS regularly shares relevant information with domestic and international partners about relevant threat information as we work to meet our mission of keeping the traveling public safe,'' the DHS official said in a written statement. "These types of regular communications are part of that important priority.''
U.S. intellegence officials have intercepted information that terrorist organizations are developing new bombs hidden in shoes. Today's bulletin is not related to a previous alert issued alerting airlines to watch for bombs concealed in toothpaste tubes during the 2014 Winter Olympic games in Sochi, Russia.
Homeland Security experts have warned that terrorist organizations have increasingly employed sophisticated bomb making techniques. Recent incidents such as the underwear bomber and the shoe bomber, both failed attempts to detonate bombs in suicide attacks over U.S. cities evidence that airliners are popular targets for terrorists.
The infamous "shoe-bomber" Richard Reid attempted to detonate explosives hidden in the soles of his shoes aboard American Airlines Flight 63, carrying 197 people from Paris to Miami was diverted to Boston on December 22, 2001.
The "shoe bomber" incident occured two months after the September 11, 2001, al-Qaeda terrorist attacks on American soil. Alert passengers and crew members witnessed Reid trying to light a fuse and restrained him by tying him to his seat.
FBI bomb technicians and explosives experts later discovered the PETN explosives in Reid's shoes.
Richard Reid, a self identified member of al-Qaeda pleaded guilty to terrorism charges in October 2002 and is currently serving a life sentence at a super-maximum security prison in Florence, Colorado.