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The rifle that federal investigators believe was used in the shooting that killed conservative activist Charlie Kirk contained ammunition inscribed with anti-fascist messaging, shedding light on the suspect’s motive.

Utah Gov. Spencer Cox confirmed the messaging at a news conference Friday, saying investigators discovered inscriptions on casings found with a bolt-action rifle near the Utah Valley University campus, where Kirk was killed during an event.

One used casing and three unused casings contained the writings, Cox said.

News of the ammunition inscriptions was first shared on social media Thursday morning in a preliminary bulletin attributed to the Bureau of Alcohol, Tobacco, Firearms and Explosives.

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