SAN ANTONIO (KTSA News) – A Texas man accused of planning a mass shooting in Lubbock has a scheduled court appearance Wednesday.

A criminal complaint filed by the Bureau of Alcohol, Tobacco, Firearms and Explosives states that 19-year-old William Patrick Williams lied about his address when he tried to buy a firearm.

Williams’ grandmother turned him in last week, possibly thwarting a mass shooting. According to an arrest warrant, he recently purchased an AK-47-style rifle and told his grandmother that he wanted to “shoot up” the Lubbock hotel where he was staying. She convinced her grandson to let her pick him up and take him to a hospital.

He reportedly told an officer at the hospital that all of his weapons were laid out in his hotel room. That’s where officers found the rifle, seventeen magazines, several knives and a black trench coat.

“This was a tragedy averted,” said U.S. Attorney Erin Nealy Cox. “I want to praise the defendant’s grandmother, who saved lives by interrupting this plot, as well as the Lubbock police officers and federal agents who investigated his unlawful acquisition of a deadly weapon.”

Cox says if you suspect a friend or loved one is planning to hurt themselves or others, don’t hesitate to call law enforcement officers.

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