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Airlines warned about shoe bombs

WASHINGTON — 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.

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A US intelligence official said that Homeland Security released a notice to airlines reiterating that liquids, shoes, and certain cosmetics were of concern, all of which are covered under existing 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.’’

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