On Friday morning, two people died in an apparent murder-suicide at Joint Base San Antonio-Lackland (JBSA) in Texas.

Police responded to an active shooter incident at roughly 8:30 am local time. When authorities arrived on the scene, they found two bodies inside Forbes Hall in the Medina Annex of the San Antonio Air Force base. The base went in total lockdown as the Bexar County Sheriff's department secured the premises.

Located about 160 miles northeast of Fort Hood — the site of the 2009 shooting massacre that left 13 dead — JBSA is the US military’s largest joint base, specializing in Air Force basic training.

“A nearby basic military training parade with anywhere from 3,000 to 5,000 spectators was about to begin on Lackland’s main base when the shooting occurred,” reports San Antonio Express-News. “The lockdown of the southwestern Bexar County base was lifted just before 10:30 a.m. Several law enforcement agencies, including the FBI, responded to the scene.”

The identities of the shooter and the victim are unknown at the time. However, Air Force Times reports that it has obtained internal Pentagon communications suggesting “the commanding officer of a training squadron at the base was shot by an airman.”

An Air Force spokeswoman at the Pentagon could not immediately confirm the internal report,” adds Air Force Times. “LaBrutta said the Air Force will not release any information on the deceased pending notification of their next of kin, or a possible motive in the shooting.”

On Friday afternoon, the Associated Press confirmed reports about an airman shooting his commander in a murder-suicide.

Before noon, Texas Governor Greg Abbott released a statement about the tragic incident:

My heart goes out to all those affected by the tragedy that unfolded this morning at Lackland Air Force Base.

Our military heroes put their lives on the line both at home and abroad, and today’s tragedy is yet another reminder of the sacrifices our men and women in uniform make daily.

Cecilia and I ask that all Texans join us in keeping these military members, their families and the Lackland community in their prayers during this difficult time.