A California cook was allegedly planning a mass shooting targeting fellow employees and guests at the hotel where he worked.

CNN reports that Rodolfo Montoya, 37, of Huntington Beach, was upset over a human resources issue at his job at a Marriott in Long Beach and planned to gun down his co-workers and hotel guests. According to the Los Angeles Times, the suspect told a co-worker on Monday that he planned to bring a gun to the hotel and shoot anyone he saw.

The co-worker reportedly notified hotel management, who reported the incident to authorities. Police went to Montoya’s home and arrested him after finding evidence including an assault rifle, which is illegal to own in California, firearms, ammunition, and tactical gear.

“Suspect Montoya had clear plans, intent, and the means to carry out an act of violence that may have resulted in a mass-casualty incident,” Long Beach Police Chief Robert Luna reportedly said at a news conference.

According to the Los Angeles Times, investigators said Montoya did not have a criminal history that would have prevented him from obtaining firearms legally, but were still working to determine if he purchased an assault rifle out of state or if he modified a weapon purchased legally in California.

Montoya is reportedly in custody in lieu of a $500,000 bond, and detectives are continuing to question him. It is unclear at this time what specific personnel issue prompted the suspect to allegedly plan a mass shooting.

[Feature image: Long Beach Police Department via AP]