At least two were killed – likely an airman and his commanding officer – in an apparent murder-suicide at Lackland Air Force Base in Texas on Friday.
"We have two dead at Lackland Air Force Base," the Bexar County Sheriff's Office tweeted. "Deputies are still inside the building."
An early morning lock-down was lifted shortly after noon, Brig. Gen. Bob Labrutta said to reporters, CNN reported.
ABC News reported the same sheriff's office later stated: "[It] appears to be murder-suicide."
Emergency officials treated the situation initially as if it were an active shooter case, and starting combing the area for the suspect.
As the Bexar Sheriff's Office tweeted: "We are responding to reports of an active shooter at Lackland Air Force Base, No confirmation at this time."
Shortly after, the same sheriff's office tweeted officials were clearing the base buildings, and closing the area to visitors, CNBC reported.
"Our deputies are inside Lackland AFB clearing buildings now," the office tweeted.
And one more tweet, from the same office: "We have victims at Lackland Air Force Base, scene is still active."
It didn't take long for law enforcement officials and various media outlets to discover and report the incident was actually a murder-suicide. Information on the victims, including their names, has not yet been released. But one Pentagon official speaking on condition of anonymity told CNN the shooter was an airman and victim, his squadron commander.
Two "male victims" and two Glock guns were found in an office at Forbes Hall, Brig. Gen. Robert LaBrutta told reporters.
The base, formally called Joint Base San Antonio-Lackland, is the home for Air Force basic training. It's located about 10 miles from San Antonio and 160 miles from Fort Hood, the 2009 site of the deadliest shooting on a military base in U.S. history, when 13 were killed and 31 injured in an attack by Nidal Hasan that was tied to radical Islamic terror.