Questions are mounting as the manhunt for Charlie Kirk's killer enters its third day following the release of new video of a person of interest .

In the latest video, which was played during a news conference with state and federal officials Thursday evening, the suspected gunman can be seen climbing down from the roof of a building on the campus of Utah Valley University where authorities believe he fired the fatal shot and fled rom the scene.

The FBI said it is offering a reward of up to $100,000 for information leading to the identification and arrest of the person responsible for Kirk's murder.

Utah authorities released photos of the person of interest in the shooting on Thursday in which the individual can be seen on steps while carrying a black backpack and wearing a shirt with

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