Hundreds of people had gathered to hear right-wing activist Charlie Kirk speak at the Utah Valley University on Wednesday.
The conservative activist and influential Trump ally was shot and killed while speaking.
BBC Verify has been piecing together a timeline of how the incident unfolded. Merlyn Thomas reports.
Produced by Michael Cox. Graphics by Mesut Ersoz.
Verification by Shayan Sardarizadeh, Jake Horton, Paul Brown, Peter Mwai, Joshua Cheetham, Kayleen Devlin.