Newhall massacre: Four California Highway Patrol officers are killed in a shootout.

The Newhall incident, also called the Newhall massacre, was a shootout on April 5–6, 1970, in Valencia, California, United States, between two heavily armed criminals and four officers of the California Highway Patrol (CHP). In less than five minutes, the four CHP officers were killed and another man was pistol-whipped in what was at the time the deadliest day in the history of California law enforcement.

The California Highway Patrol (CHP) is the principal state police agency for the U.S. state of California. The CHP has primary jurisdiction, including patrol and investigations, over all California freeways and state property. Additionally, the CHP is responsible for the enforcement of all laws regulating the operation of vehicles on highways, including all roadways, outside incorporated city limits. The CHP can exercise law enforcement powers anywhere within the state.