U.S. military veterans in Florida who served in Iraq or Syria were warned on Thursday of a possible terrorist threat in the state.

U.S. Army Special Operations Command issued an alert, obtained by the New York Times, specifically warning retired service members of the threat, adding that it didn’t pertain to active duty service members. Signed by the command’s provost marshal, Col. Mark A. Katz, the alert warned retired service members “to remain vigilant.”

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Though active duty service members weren’t being targeted, the notice urged them “to remain alert to their surroundings, both on and off post, and to report any suspicious activity to appropriate authorities.”

No specific details were given as to what group, if any, was behind the threat, but command spokeswoman Col. Allie Scott told the outlet it was deemed credible enough to prompt the warning.

The United States keeps the identities of many special forces soldiers involved in foreign combat operations a secret to prevent retaliation against them or their families at home. Retired service members are more vulnerable as they aren’t given as stringent protections after leaving the military.

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The U.S. deployed its first special forces to Syria in September 2014 as part of Operation Inherent Resolve, the U.S.-led coalition’s campaign against ISIS. The troops were deployed alongside Kurdish forces in northeast Syria for advisory roles and targeted raids. U.S. Special Forces were present in Iraq for much longer, beginning with the U.S. invasion in 2003.

Though significantly downsized from their peak, U.S. forces remain in Iraq and Syria.