The Department of Homeland Security has issued an alert to airlines about a possible shoe-bomb threat on flights entering the United States from overseas. The warning does not apply to domestic flights.

Homeland Security said it has recent and credible intelligence to back the threat. Security screeners are being urged to use detection swabs on shoes.

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DHS said in a statement, “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 … These types of regular communications are part of that important priority.”

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