Tyler Robinson, the accused killer of U.S. conservative commentator Charlie Kirk, inscribed messages on four bullet casings found with the suspected murder weapon, according to authorities in Utah.

Kirk, 31, a key ally of U.S. President Donald Trump, was shot dead on Wednesday while speaking at an event on the campus of Utah Valley University.

Investigators said they found the casings along with a .30-calibre bolt-action Mauser rifle wrapped in a towel in a grassy area along the route they believe Robinson took to flee the scene of the shooting.

During Friday's news conference announcing the 22-year-old Robinson was in custody, Utah Gov. Spencer Cox listed the words and symbols found on three unfired bullet casings and a fourth that was spent:

"Hey, fascist! Catch!" followed by a serie

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