According to the Wall Street Journal, law enforcement have identified a man that they suspect illegally manufactured and sold the rifle that was used in Saturday’s massacre in West Texas.

Authorities have been investigating the man hailing from Lubbock, Texas. His identity hasn’t been released and authorities were trying to question him late Wednesday at his residence.

The ATF has been trying to find out how Seth Aaron Ator, the gunman, was able to buy the AR-15 style-rifle that he used to kill seven people and wound 22 people before police shot and killed him.

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The 36-year-old assailant was already prohibited by federal law from owning a firearm because a court previously found him to be mentally unstable according to law enforcement reports. In January 2014, he tried to buy a gun but failed to do so because the National Instant Criminal Background Check System (NICS) caught the mental health court order and barred the purchase, according to official reports.

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