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The U.S. military has raised its alert level for bases in North America to its highest since the 10th anniversary of 9/11 in the face of mounting threats from Islamic State sympathizers on American soil.

The move, which officials said is not based on a specific threat, was “informed by recent events,” a spokesman for U.S. Northern Command told Fox News.

The level, known as “Bravo,” is the third of five levels of alert and means increased security at military posts across the country. A day earlier, FBI Director James Comey offered blunt remarks about the domestic threat from ISIS sympathizers, saying hundreds and possibly thousands of people in America are following ISIS on social media and consuming their “poison.”