The gunman who attacked worshipers at a Texas church, killing 26, was in a mental health facility in New Mexico and briefly escaped in 2012.
An El Paso, Texas, police incident report said Devin Patrick Kelley was stationed at Holloman Air Force Base when he was caught trying to bring firearms onto the base.
The report first obtained by KPRC-TV in Houston also says Kelley, 21 at the time, had made death threats against superior officers.
He was committed to a mental health facility in Santa Teresa, New Mexico, but at some point escaped and was later found by police at a bus station in downtown El Paso in June 2012.
Meanwhile, Defense Secretary Jim Mattis said he has directed the Pentagon's watchdog to examine the circumstances of the Air Force's failure to report the Texas church shooter's domestic violence conviction to the FBI.
Mattis said we have to "find out what's going on."
Under Pentagon rules, convictions of military personnel in crimes like assault should be shared with the FBI for its National Criminal Information Center database.
Kelley was convicted of assault against his wife and stepson in an Air Force court-martial in 2012.
Mattis said the Pentagon must make certain it's going in "the right direction." And he said he must "define what the problem is."
"If the problem is we didn't put something out, we'll correct that," he said.
Officials said at least five people injured in the South Texas church shooting are still being treated at hospitals.
Spokeswoman Megan Posey said one patient remains listed in stable condition Tuesday at Connally Memorial Medical Center in Floresville, Texas.
Two adults and two children who were hurt in the gunfire at the First Baptist Church in Sutherland Springs on Sunday are still hospitalized at the University Health System in San Antonio.
Spokesman Don Finley said their conditions range from serious to critical.
Brooke Army Medical Center in San Antonio hasn't responded to a request for details on patients being treated there.
Authorities said Kelley fired at least 450 rounds in the attack Sunday that left 26 dead.
A Texas couple who attended Sunday's service said Kelley appeared to target babies who cried and others who screamed or made noise.
Roseanne Solis and her husband Joaquin Ramirez told KSAT-TV on Monday that people fell to the ground after the man sprayed gunfire from outside the church.
Solis said there was a moment of silence before Kelley yelled, "Everybody die!" and then another round of gunfire began.
Ramirez said after entering the church, Kelley first shot those in charge of the camera and audio of the service. He then moved down the center aisle toward those on the church dais.
Solis was treated for a gunshot wound to the shoulder.
Sutherland Springs is about 35 miles southeast of San Antonio.