Two other officers were injured in the shooting in York County, officials said, adding that the person who fired on the officers was also dead.

© Matt Slocum/Associated Press

The New York Times examined video footage to better understand what was said during Mr. Kirk’s event at Utah Valley University.

© Tess Crowley/The Deseret News, via Associated Press

The widespread and fast-moving campaign has already resulted in lost jobs, suspensions and internal investigations, heightening tensions online between supporters and detractors of Charlie Kirk.

© Loren Elliott for The New York Times

Mr. Kirk, 31, the founder of a right-wing youth movement, was shot while speaking at Utah Valley University on Wednesday.

© Kim Raff for The New York Times