A California man was busted with a cache of weapons, a racist manifesto and bullets inscribed with phrases like “cop killer” and “first of many,” authorities said.

Wesley Charles Martines, 32, was spotted prowling outside a business in Campbell on July 9. Responding officers stopped his truck, where they found two AR-style rifles, a Glock 9mm handgun and personally inscribed ammunition with sayings like “to a widow, from the Grim Reaper,” according to the Santa Clara County District Attorney’s Office.

Investigators also discovered body armor, heroin, meth and an inactive pipe bomb filled with pellets inside the truck — as well as a journal with racist and anti-Semitic writings detailing Martines’ plan to disguise himself as an employee at a sporting goods store and tie everyone up, authorities said.

Martines’ writings indicated he wanted to “wipe out the Black, Hispanic and Jewish populations,” according to prosecutors.

“Once again, law enforcement saved lives before the blood and tears flowed,” District Attorney Jeff Rosen said.

Campbell police Capt. Ian White told the East Bay Times Thursday investigators believe they “prevented a tragic incident” by arresting Martines, who remains held on $300,000 bail.

“There’s a lot of evidence to unpack still, but based on what we have seen thus far and what was recovered in the car, we believe that this person was going to commit some sort of violence against the community,” White told the newspaper.