Man accused of allegedly plotting next US massacre is charged

Rodolfo Montoya faces four felony charges; Montoya, a California Marriott hotel cook, allegedly told a coworker that he planned to attack coworkers and guests, authorities said.
2:34 | 08/23/19

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Transcript for Man accused of allegedly plotting next US massacre is charged
The alleged plot to shoot up that hotel, targeting workers and guests. And the suspect was charged and in court just moments ago. Tonight, new details coming in about the alleged plot. The hotel cook arrested. The arsenal seized at his home. Hundreds of rounds of ammunition, an ar-15 among the weapons. This all comes amid two more cases today, two young people arrested. But we begin with that hotel plot in California, and ABC's will Carr leads us off. Reporter: Tonight, the man accused by authorities of plotting America's next massacre appeared in court for the first time. 37-year-old Rodolfo Montoya behind that glass divider, now charged with four felonies. Police say they found a stash of weapons inside Montoya's home, including hundreds of rounds of ammunition, tactical gear and an automatic rifle and high capacity magazines, both are illegal in California. Authorities say on Monday, Montoya, a hotel cook, told a hotel worker about his planned attack. He was going to shoot up fellow employees and people coming into the hotel. Reporter: That coworker told hotel management, who then called police. Montoya was arrested at his home, with authorities allegedly found that arsenal of weapons. Tonight, employees at the Marriott are grateful that hotel management called police after learning about the alleged plot. So blessed that I'm alive and I'm -- that I'm fine and everybody's here is fine, because that's horrible. Reporter: Since the tragedies in Dayton and El Paso, there have been more than a dozen Ares for alleged threats of mass shootings across the country, including in Ohio, where this man, who police say wanted to shoot up a jewish community center, was arrested after posting this disturbing video online. In Florida, a mother pleads with police after her teenage son is arrested. He didn't do anything wrong. Yes, he's 15, but he's still a little boy and he's not one of the crazy people out there doing stuff. Reporter: And today, also in Florida, at least two students in separate schools arrested for alleged threats at the start of the school year. And will Carr with us live again tonight in the case of that California hotel cook. I know police now investigating how he allegedly obtained some of those weapons, will? Reporter: That's right, David. We know that ar-15 he allegedly had was illegal here authorities now want to know exactly where he got it from. And we've heard across the country that saying, if you see something, say something. Tonight, authorities are strengthening their language, saying if you see, hear or even read something suspicious, you should report it. David? Will Carr leading us off. Will, thank you.

This transcript has been automatically generated and may not be 100% accurate.

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