A reward of $100,000 was offered last night to catch the killer of conservative activist Charlie Kirk after he was shot dead on a US university campus.

Officials released images yesterday of the suspect thought to have murdered the MAGA cheerleader on Wednesday with a single shot fired from a rooftop 142 yards away.

As the hunt continued, aided by the offer of £73,650, enforcement agencies ditched a press conference due to 'rapid developments in our investigation'.

Detectives found a 'high-powered bolt action rifle' yesterday – said to be an imported .30-calibre Mauser – wrapped in a towel in a wooded area near Utah Valley University, which they believe to be the murder weapon.

The gun was said to have contained ammunition engraved with 'transgender and anti-fascist statements', according to a preliminary report from the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) reported by the Wall Street Journal.