A Texas school bus carrying more than 40 students on Wednesday rolled over after veering off a rural road on the first day of class, injuring multiple students, authorities said.

At least one person has life-threatening injuries, while two others have “potentially life-threatening injuries,” Assistant Chief Kevin Parker, with Austin-Travis County Emergency Medical Services, said during a news conference.

The bus was traveling on a rural stretch of two-lane road when it veered off the right side “for an unknown reason” and rolled over, said Department of Public Safety Sgt. Billy Ray, adding authorities were still investigating the cause of the crash.

Video footage of the scene showed the yellow school bus lying on its side next the road with its roof damaged and several windows broken.

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