Concerns of a jihadist threat in the country prompted security conditions at U.S. military bases to be raised Thursday night, CNN reports.
Adm. William Gortney, head of the command, signed the order.
Army Colonel Steve Warren said the decision was based not on any specific threats but rather a broader security climate that included last weekend's killing of two men who opened fire on a Texas contest for cartoonists drawing the Prophet Mohammad.
"We have a general concern, obviously, that ISIL is focusing on the uniformed military and law enforcement," FBI Director James Comey told reporters Thursday.
Comey had expressed concerns earlier on Thursday that there are thousands of ISIS followers online in the U.S.
[Capt. Jeff] Davis declined to specify the new security measures. But a U.S. official confirmed to CNN that U.S. military bases are now at "Force Protection Bravo," which is defined by the Pentagon as an "increased and predictable threat of terrorism." U.S. bases generally have not been at this level since the tenth anniversary of the 9-11 attacks the official said.
The increased security could mean more vehicle checks entering bases and full identity checks of all personnel.
Read more from CNN.
Reuters contributed to this report.