Shoe Bombs?

I was reading this article thinking more about this today because the sole of a shoe could easily be a place to put a bomb especially if it were C-4 or something like that which is sort of like clay or maleable. I was also thinking that boots or high heeled shoes with more room in the soles would even be a better place for storing a C-4 type of explosive as well. Maybe this is what they are talking about here below:
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Homeland Security Warns Airlines of New Threat

ABC News

- ‎4 minutes ago‎

The Homeland Security Department has warned airlines that terrorists could try to hide explosives in shoes. It's the second time in less than three weeks that the government has issued a warning about possible attempts to smuggle explosives on a ...

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Homeland Security Warns Airlines of New Threat

WASHINGTON February 20, 2014 (AP)

By ALICIA A. CALDWELL and KIMBERLY DOZIER Associated Press

The Homeland Security Department has warned airlines that terrorists could try to hide explosives in shoes. It's the second time in less than three weeks that the government has issued a warning about possible attempts to smuggle explosives on a commercial jetliner.

Homeland Security said Wednesday it regularly shares relevant information with domestic and international partners, but it declined to discuss specifics of a warning sent to airlines.

"Our security apparatus includes a number of measures, both seen and unseen, informed by the latest intelligence and as always DHS continues to adjust security measures to fit an ever evolving threat environment," the department said in a statement.

A U.S. intelligence official told The Associated Press that DHS released a notice to airlines reiterating that liquids, shoes and certain cosmetics were of concern, all of which are covered under existing Transportation Security Administration security policies.

The latest warning was focused on flights headed to the United States from abroad.

The official said "something caused DHS concern, but it's a very low threshold to trigger a warning like this." The official spoke on condition of anonymity because he was not authorized to discuss the issue publicly.

Earlier this month Homeland Security warned airlines with flights to Russia to be on the lookout for explosive devices possibly hidden inside toothpaste. The Transportation Security Administration then banned passengers from bringing any liquids in their carry-on luggage on nonstop flights from the U.S. to Russia. That warning became public just days before the opening ceremonies of the Winter Olympics in Sochi.

It is unclear if the latest warning, first reported Wednesday by NBC News, is related to the earlier threats to Russia-bound flights.

Air passengers in the United States have had to take off their shoes at airport security checkpoints since shortly after Richard Reid tried to ignite explosives hidden in his shoes on a Miami-bound flight in late 2001. Reid pleaded guilty to terrorism charges and is serving a life sentence.

The traveling public has grown increasingly impatient with expanding security checks at airports.

TSA in recent years has changed some security procedures to allow young children and passengers 75 and older to keep their shoes on. The security agency has also launched a fee-based program that allows willing flyers to submit to background checks and avoid having to remove their shoes, jackets and small amounts of liquids packed in carry-on luggage.

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Follow Alicia A. Caldwell on Twitter at www.twitter.com/acaldwellap

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Homeland Security Warns Airlines of New Threat