LEANDER, Texas (AP) — 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.

The injured were transported to local hospitals via ambulance and helicopter. The cause of the crash remains unknown, and the incident is under investigation.

A school bus carrying 42 children and one adult on the first day of the new school year rolled over onto its side near Austin, Texas, on Wednesday, leaving 12 injured.