A suspect in the fatal shooting of conservative activist Charlie Kirk at a Utah university has been taken into custody, US President Donald Trump says.

Kirk's killer has eluded police and federal agents for more than 24 hours after Wednesday's shooting, in which a sniper fired a single gunshot that killed Kirk during an appearance at Utah Valley University in Orem.

"I think we have him," Trump told Fox News in an interview, adding that a person who knows the suspect had turned him in.

Mr Trump told Fox he didn't know if the suspect was part of a bigger network.

A source familiar with the operation confirmed with Reuters that a suspect in the shooting was in the custody of Utah state law enforcement.

Previously, US investigators said they had found the bolt-action rifle believed to hav

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