A friend of one of the San Bernardino shooters who is believed to have purchased the guns used in the massacre last week has reportedly entered a mental hospital after the attacks.

The Los Angeles Times reported that Enrique Marquez was questioned by federal investigators over the weekend while they determine if he purchased two assault weapons used by Syed Rizwan Farook and wife Tashfeen Malik in the massacre at a social service center last Wednesday.

A source told the newspaper that there are no indications that Marquez knew about attacks that left 14 dead and 21 injured. It is unclear if he will be charged.

FBI agents searched Marquez’s home in Riverside, California this past weekend.

“I was woken up at about 1:30 a.m. and hear police saying, ‘residents of 3838, come out now with your hands up’,” an unnamed neighbor told the Daily Mail. “There were lots of FBI, lots of cop. They were there for a couple of hours – it was about 3:30 a.m. when they left, something like that.”

On Sunday, agents were spotted leaving the home with a large cardboard box. According to the Washington Post, they declined to identify themselves or their agency to reporters outside and did not disclose the box’s contents.

Lorena Agurre, who lives across the street from the home Marquez shares with his father and brother, told the Daily Mail that Farook’s friend was “quiet” and “shy.”

“He would smile but I would have to initiate conversation. He didn’t make small talk,” she added.

Agurre said that Farook and Marquez seemed to bond over a mutual love of cars.

“He didn’t socialize much with the kids nearby. The only person I ever saw him with was Syed but I never spoke to them when they were together,” she said. “Syed was obsessive about cars. He would be there tinkering with cars all the time and sometimes Enrique would be with him.”

Investigators are working to piece together a picture of Farook and Malik’s past and their radicalization.

On Mondaym, the FBI said the couple had participated in target practice, including once within days of the attack that killed 14 people.

David Bowdich, assistant director of the FBI's Los Angeles office, said Farook and his wife participated in target practice at ranges in the Los Angeles area. He says the bureau believes both were radicalized and had been "for some time." He says the bureau doesn't know when or how they were radicalized.

The couple fired at least 65 shots when they stormed a holiday party at the Inland Regional Center on Dec. 2, where about 80 of Farook’s co-workers at the San Bernardino Department of Public Health had gathered.

Farook and Malik died in a shootout with police hours after their rampage.

The FBI said Friday that it is investigating the shooting as an act of terrorism. If the massacre was inspired by Islamic extremism, it would be the deadliest such attack on U.S. soil since Sept. 11, 2001.

The Associated Press contributed to this report.

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