Senior law enforcement officials say a potential shoe-bomb threat is tied to an al Qaeda affiliate in Yemen.

Officials say the affiliate’s leaders are tech-savvy bomb makers.

DHS Warns of Possible Shoe-Bomb Threats on U.S.-Bound Flights

Warnings were sent to airlines flying to the U.S. from about 30 airports in Europe, the Middle East and Africa.

Stay with Fox News for more on this developing story.