A vigil was held in the U.S. state of Utah as investigators appealed for the public's help in finding the person who assassinated conservative activist Charlie Kirk.

The search continued early Friday, nearly two days after Kirk was killed on the Utah Valley University campus in Orem.

As the hunt took place, residents gathered in the city to mourn Kirk's death.

They placed flowers and candles at a makeshift memorial.

Authorities have released photos and video of the person who they believe is responsible traversing the campus.

Other clues include a palm print, a shoe impression and a high-powered rifle found in a wooded area along the path the shooter fled.

But they have yet to name a suspect or cite a motive in the killing.