A friend of one of the shooters in the 2015 terrorist attack in San Bernardino, Calif., has agreed to plead guilty to buying the weaponry used in the massacre and planning to carry out other stunning acts of violence, court records show.

Enrique Marquez Jr., 25, of Riverside, Calif., signed documents agreeing to plead guilty to conspiring to provide material support to terrorists and making false statements in connection with the acquisition of a firearm — federal counts that carry a maximum sentence of 25 years in prison. He is scheduled to appear before a federal judge Thursday for sentencing.

Marquez is the former neighbor and a longtime friend of Syed Rizwan Farook, the county Health Department employee who, along with his wife, Tashfeen Malik, killed 14 people and injured 22 in a shooting at the Inland Regional Center in December 2015. Marquez was not present during the attack and told the FBI that he had no prior knowledge of it. But he admitted that he bought two rifles for Farook that were used in the shooting, as well as a bottle of explosive powder that investigators seized from Farook’s home.

Farook and his wife were killed in a shootout with police after the attack. Marquez, after hearing news reports about what had happened, called 911 to say that he believed his guns had been used.

Marquez admitted that he and Farook had developed other terrorist plots that they never carried out. They envisioned, for example, throwing pipe bombs into a cafeteria at Riverside City College, where they had once been students. They also had plotted to throw bombs onto a highway during rush hour and to open fire on the stopped cars.

Washington Post