Days after a terrorist attack in Texas for which ISIS has claimed responsibility, the U.S. military has raised its alert level for bases in North America to its highest since the 10th anniversary of 9/11. The move to level “Bravo” was not based on specific threats from ISIS but was “informed by recent events,” a spokesman for U.S. Northern Command told Fox News. “Bravo,” the third of five levels of alert, requires increased security at military posts in the country.

FBI Director James Comey warned Thursday of domestic threat from ISIS sympathizers, saying hundreds and possibly thousands of people in America are following ISIS on social media and consuming their “poison.” A Defense Department statement said the move is “a prudent measure to remind installation commanders at all levels within the USNORTHCOM area of responsibility to ensure increased vigilance and safeguarding of all DOD personnel, installations and facilities.” “This change, in addition to random drills or exercises, is a mean to ensure that we effectively execute our force protection mission,” the Defense Department said. MORE