The US Air Force is investigating how it handled the criminal records of the gunman behind Sunday's church shooting in Texas.
It says Devin P Kelley's domestic violence offence wasn't entered into the national database.
Police say Kelley sent threatening text messages to his mother-in-law in recent days.
At least 26 people, including children, were killed in the attack.
Al Jazeera's Heidi Zhou-Castro reports from Sutherland Springs, Texas.
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