ABILENE, Texas (AP) A state highway patrolman says it will take time for investigators to determine why an Abilene Christian University bus left the highway and overturned, killing one student and critically injuring four others.

State Trooper Phillip Sparky Dean said investigators are interviewing occupants of the bus and a lot of possibilities are being considered for Friday's crash.

The school-owned bus was carrying 12 students, three faculty members and a faculty member's wife from Abilene to Medina, where they were going to spend the weekend doing mission work. Authorities say the 34-year-old driver lost control as the bus was entering a bend on U.S. 83 near Ballinger. The vehicle hit a concrete culvert and did a complete roll.

Anabel Reid, a sophomore from Petersburg, was pronounced dead at the scene.

A student from Midlothian and another from Colleyville were injured.

Of the 15 who were hurt, five have been released from the hospital and two remained in critical condition a student and a professor.

ACU president Phil Schubert said Saturday the next step is letting everyone grieve.

"There was tremendous amount of outpouring of support and concern," he said. "These unfortunate circumstances are great reminders about the blessings of the community and the power of friendship. All that comes into play when a community comes together to walk through a difficult time like this certainly represents."

A candlelight vigil was held Friday night to support friends and family of the girl who died, and the 15 others injured in the crash.

The university said people from all over the country are sending e-mails of concern and blessings.

WFAA and the Associated Press contributed to this report.

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