(CNN) — U.S. security officials are warning airlines about a potential new shoe bomb threat.
New intelligence suggests terrorists may try to hide explosives in their shoes, but officials stress there is no specific threat or plot.
Shortly after the 9/11 attacks, passengers on an American Airlines flight stopped Richard Reid from detonating explosives in his shoes. He pleaded guilty and is serving a life sentence.
Terrorism experts say that airlines continue to be a target of terrorists.