Transport security

U.S. Eyes Travel of 800 Potential 'Foreign Fighters'

As ISIS threatens to strike inside the U.S., airlines are keeping their schedules of flights from the U.S. to Paris and back, but U.S. authorities are intensively scrutinizing passenger lists on inbound flights.

Intelligence officials say that U.S. terror databases contain more than 2,700 names with connections to France, and NBC News has learned that 801 of them are considered potential "foreign fighters" who might try to join ISIS in Syria. Authorities are paying particular attention to their attempts to travel.

Five of the individuals on the potential foreign fighter list have traveled or tried to travel to or from France in the past three months.