A sheriff's spokesman says two people are dead in an apparent murder-suicide at a U.S. Air Force base in San Antonio.

Bexar (pronounced bayr) County sheriff's spokesman James Keith said two bodies were found Friday morning inside a room of a building at Joint Base San Antonio-Lackland.

Keith says it's believed the shooter is among the two dead, but that sheriff's deputies and other law enforcement officers are continuing to search the building and nearby facilities.

A senior US official told AP that an Airman shot his commander in apparent murder-suicide.

Lackland is a key training installation for the Air Force.

In 2009, Fort Hood, which is about 160 miles from Lackland Air Force Base, was the site of the deadliest shooting at a U.S. military base, when 13 people were killed and 31 were injured.