SAN ANTONIO, April 8 (Reuters) - Two men were killed in an apparent murder-suicide at Lackland Air Force Base in San Antonio, Texas, on Friday, military officials and police said, with media outlets reporting that an airman shot his commanding officer.

Military officials and the Federal Bureau of Investigation said the shooting was not an act of terrorism.

Two weapons identified as Glocks were found at the scene, Brigadier General Robert LaBrutta, Commander, Joint Base San Antonio, told a news conference. LaBrutta said the two men were the only casualties and he declined to provide further details such as a possible motive.

The Air Force Times, citing internal Pentagon communications, reported that the commanding officer of a training squadron at the base was shot by an airman. A Pentagon official, speakingon condition on anonymity, told CNN that the airman shot his commander.

Pentagon officials would not confirm the reports.

"This morning we received one of those calls you never want to receive," LaBrutta told reporters.

"Our hearts and prayers go out to the families that are going to be affected by this tragedy," he said.

LaBrutta said that after an initial report of a shooter, security officers rushed to the scene within three minutes. Both victims were found in an office in what officials said was an apparent murder-suicide.

The shootings occurred at the Medina annex, where operations such as military dog training take place.

The Federal Bureau of Investigation was called to assist and has taken the lead in the case, the Bexar County Sheriff's office said.

(Additional reporting by Jon Herskovitz in Austin