Investigators searching for the man who killed right-wing activist Charlie Kirk appealed for the public's help Thursday, with no one in custody more than a day after a murder that has rocked America's fractious politics.

Kirk, a 31-year-old superstar on the Republican right who harnessed surging youth support for President Donald Trump, was shot dead while addressing a large crowd at Utah Valley University on Wednesday.

Hundreds of agents from across 20 law enforcement agencies are combing for clues to the identity of the culprit, but at a Thursday evening media briefing, they appeared to have little to show.

"We cannot do our job without the public's help," Utah Governor Spencer Cox told reporters, adding they had received more than 7,000 leads.

"We need as many, as much help as we ca

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