Breaking News Emails

Get breaking news alerts and special reports. The news and stories that matter, delivered weekday mornings.
 / Updated 
By Jim Miklaszewski, Erin McClam and Courtney Kube

The military plans to increase security at recruiting stations and reserve centers, following the shooting rampage in Chattanooga, Tennessee, last week that left five service members dead, two defense officials told NBC News on Monday.

Adm. Bill Gortney, the head of U.S. Northern Command, sent a directive Sunday night identifying measures to be taken, the officials said.

The officials could not discuss the nature of the security measures — but they did say that the measures will not include arming personnel at off-base facilities like the ones attacked in Chattanooga.

Related: Sergeant in Chattanooga Rampage Describes Attack

The Army chief of staff said last week that recruiters are not armed because of the 1878 law that prevents the military from engaging in domestic law enforcement. He also said it would raise the possibility of accidents.

Asked why Gortney decided to make the changes, one official said that the military is “definitely concerned with homegrown violent extremists,” and that “an additional attack is always possible.”

Mohammad Youssuf Abdulazeez, 24, opened fire at a recruiting station and a Navy and Marine reserve center on Thursday. Four Marines and a sailor were killed.

Related: Gunman Was on Downward Spiral, Family Rep Says

The governors of at least six states have ordered National Guardsmen armed, and Florida will move its Guard recruiters from storefronts, like the one attacked in Chattanooga, to armories.

Tennessee Gov. Bill Haslam said Sunday on "Meet the Press" that he would order a review of security at state military facilities.

Police officers, one a member of a “Hercules” team, left, stand guard outside the Times Square Armed Forces Recruiting Station, a day after a gunman killed four Marines in Tennessee in an attack on two military sites, in New York, July 17, 2015. About a dozen uniformed police officers stood outside the famed recruitment center on Friday.MARK KAUZLARICH / The New York Times via Redux Pictures
Associated Press contributed.