 Many American troops overseas could be targets. U.S. military bases in Europe have been put on heightened alert status with a defense official telling Fox there is credible intelligence of a plot to attack American bases. This is there's growing concern about potential terrorism inside the U.S. after the arrest of eight men from Tajikistan with ties to ISIS who crossed the southern border illegally. There's also a report that Homeland Security had ID'd hundreds of people brought to the U.S. by an ISIS-affiliated network.