That incident came just a month after a gunman in Las Vegas opened fire on an outdoor music festival, killing 58 people and wounding hundreds in the deadliest mass shooting in recent US history.
Mr Sessions called for clarity from federal agencies in cases where people had lied on their gun-purchase applications.
“The recent shooting in Sutherland Springs, Texas revealed that relevant information may not be getting reported to the National Instant Criminal Background Check System (Nics) – this is alarming and it is unacceptable,” he said in a statement on Wednesday.
Mr Sessions said he was directing the FBI and the Bureau of Alcohol, Tobacco, Firearms and Explosives “to do a comprehensive review of the Nics” and report back to him the measures that could be taken to ensure that “people who are prohibited from purchasing firearms are prevented from doing so”.
He said that Texas gunman Devin Kelley’s 2012 conviction for domestic assault showed that not all the necessary information was being added to the Nics.
Kelley, a former Air Force serviceman, was convicted for assaulting his first wife and a stepson. US federal law does not allow anyone to sell a gun to someone who has been convicted of a crime involving domestic violence against a spouse or child.
The gunman killed himself while trying to get away after the shooting. He is believed to have bought guns from a store in Texas in 2016 and 2017, but it is not clear whether they were used in the attack.
The Pentagon has already launched its own inquiry into Kelley. The House of Representatives Armed Services Committee has said that it will be investigating the Air Force’s alleged failure to notify the FBI of Kelley’s criminal record.
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