A 13-year-old was driving the pickup truck that hit a University of the Southwest bus in a head-on collision Tuesday night in West Texas, killing nine people, National Transportation Safety Board Vice Chairman Bruce Landsberg said on Thursday.

The pickup truck crossed into the opposite lane on a two-lane highway in West Texas when it hit the bus, which was carrying the university's men’s and women’s golf teams.

Multiple University of Southwest student athletes were killed in West Texas on Tuesday night after a university bus carrying the men’s and women’s golf teams was involved in a head-on crash with a pickup truck, officials said Wednesday.

A 13-year-old was driving the pickup truck that hit a University of the Southwest bus in a head-on collision Tuesday night in West Texas, killing nine people, National Transportation Safety Board Vice Chairman Bruce Landsberg said on Thursday. (KWES via AP)

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Landsberg said that while the speed of the two vehicles is unclear, "this was clearly a high-speed collision."

Fox News' Stephen Sorace and the Associated Press contributed to this report.