A disgruntled hotel employee was arrested in California after threatening to shoot up the hotel he works at.

Rodolfo Montoya was arrested Tuesday at his Huntington Beach, California, home near Los Angeles after making threats to shoot up the Marriott hotel to a coworker on Monday. Police were notified of the threat, and began looking into the possible threat Montoya posed, investigating his activities and home.

When officers arrived at Montoya’s home, they uncovered multiple high-powered weapons and hundreds of rounds of ammunition at his home. The findings included at least one reported assault rifle, 38 30-round magazines, and tactical gear. The 37-year-old hotel employee was promptly arrested after the discovery.

“Thank God that employee decided to bring that information forward,” Long Beach Police Chief Robert G. Luna said in an interview. “He's alleged to have said ... he was going to shoot up fellow employees and people coming into the hotel.”

Luna continued from there, saying that Montoya “had clear plans, intent and the means to carry out an act of violence that may have resulted in a mass casualty incident.”

Montoya has been charged with manufacturing and distributing assault weapons, possession of an assault weapon, and making a criminal threat. He is currently being held on $500,000 bail.

It’s also the latest arrest to occur in the last few weeks after police have been notified of mass shooting threats. One of the most recent was a Florida teen who had posted about committing a shooting on a message board, though he argued that it was meant as a joke.

Massachusetts police Representational image of a police officer using his K9 to check a car near John Joseph Moakley United States Courthouse in Boston, Massachusetts, on April 6, 2015. Photo: Scott Eisen/Getty Images