Authorities have shared their most detailed account yet of the investigation set off by the killing of American conservative activist Charlie Kirk, which concluded with a suspect surrendering to police.

Here are key details Utah County prosecutor Jeffrey Gray released about the case centering on 22-year-old suspect Tyler Robinson:

- 'Sniper positions' -

When a lone gunshot rang out during Kirk's outdoor event on September 10, a Utah Valley University police officer believed the weapon to be a rifle "because of its sound," Gray said, and began looking for "potential sniper positions."

About 160 yards (150 meters) away, the officer spotted a roof area "as a potential shooting position."

There, he found "impressions in the gravel" consistent with the body of a "person in a prone shooting

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