US President Donald Trump on Friday announced that the suspect had been taken into custody over the killing of right-wing activist Charlie Kirk after a massive manhunt.

"Somebody very close to him turned him in," Trump told Fox News in a live studio interview.

"The person was involved with law enforcement, but was a person of faith, a minister, and brought him to a US Marshal who was fantastic.

"They drove into the police headquarters, and he's there now."

He added: "We have the person that we think is the person we're looking for."

The gunman fired a single, fatal shot killing Kirk -- a 31-year-old who rallied youth support for Trump -- during an appearance at a Utah university on Wednesday.

Hundreds of agents from across 20 law enforcement agencies were involved in the hunt.

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