United States authorities have arrested a suspect in the fatal shooting of conservative activist Charlie Kirk.

Law enforcement officials identified the suspect as 21-year-old Tyler Robinson from Utah, according to NBC News, citing five senior law enforcement sources.

Kirk was fatally shot in the neck on Tuesday while speaking at a debate at Utah Valley University.

Authorities said the attacker fired a single round from a rooftop in what they described as a targeted assassination.

US President Donald Trump confirmed the arrest, telling Fox News that investigators acted “with a high degree of certainty” in taking Robinson into custody.

Trump praised the joint efforts of local police and state officials in the investigation.