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Investigators say the now-deceased gunman who opened fire at a Nashville, Tennessee, high school on Wednesday, killing a female student and injuring another student before turning the gun on himself, was “significantly influenced” by web-based material found on sites “most would find harmful and objectionable.”

On Wednesday, Metropolitan Nashville police identified 17-year-old Solomon Henderson as the shooter at Antioch High School who killed Josselin Corea Escalante, 16, and injured a 17-year-old student who suffered a wound after being grazed by a bullet. The latter has since been treated and released from the hospital.

In a news release on Thursday, police said the investigation into the murder-suicide inside the school’s cafeteria determined that Henderson fired 10 shots from a 9 mm pistol within 16 seconds after entering the room.

The handgun, police said, was loaded with nine rounds when it was recovered by investigators. A magazine loaded with seven rounds was also recovered from the cafeteria floor.

The shooting inside Antioch High School left two dead, including the shooter. (AP Photo/George Walker IV)

The documents and other evidence found at the residence, police said, are being closely looked at by homicide unit detectives as well as detectives from the Specialized Investigations Division and the FBI.

“It is clear that Henderson was significantly influenced by web-based material, especially that found on non-traditional sites that most would find harmful and objectionable,” police said.

Additionally, it was learned the pistol was purchased by an individual in Arizona in 2022 and had not been reported stolen. 

The Bureau of Alcohol, Tobacco, Firearms and Explosives is helping police determine how Henderson acquired the handgun.

Fox News Digital’s Greg Norman and Christina Shaw contributed to this report.