A search was continuing Thursday for the person who shot and killed Charlie Kirk at an event at Utah Valley University. Kirk , a prominent conservative activist who co-founded the right-wing advocacy group Turning Point USA, was 31.

Authorities have not yet identified or apprehended a suspect nor specified a motive, but on Thursday officials revealed new details about the shooter's movements, a weapon that was recovered and the investigation.

The Utah Public Safety Department and the Salt Lake City FBI office also posted two images of someone they called a "person of interest," showing an individual appearing to be wearing a dark long-sleeve shirt, and a hat and sunglasses. It asked for the public's help in identifying the person.

The FBI said it is seeking the public's help

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