Search on for Kirk killer

A massive manhunt is underway for a sniper who assassinated Charlie Kirk, a conservative activist and close ally of President Donald Trump.

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Mr Kirk was killed by a single gunshot fired from a distant rooftop at the Utah Valley University campus, where he was speaking on Wednesday.

Federal, state and local authorities said they were working on Thursday on “multiple active crime scenes”.

“This is a dark day for our state. It's a tragic day for our nation,” said Utah Governor Spencer Cox.

“I want to be very clear, this is a political assassination.”

Mr Trump announced Mr Kirk’s death on social media and praised the 31-year-old co-founder and CEO of Turning Point as “great, and even legendary” and blamed the rhetoric of the “radical left” for the killing.