SAO PAULO (AP) — A bus carrying university students and a truck collided on a highway in southeastern Brazil, killing 12 passengers and injuring 21 others, authorities said Friday.

The truck driver, who was also injured, tried to flee the scene of the crash late Thursday night on a highway near Nuporanga, a city about 370 kilometers (230 miles) from the state’s capital, but was caught and hospitalized. He was later charged with attempting to flee the scene, involuntary homicide and bodily harm.

All of the dead were students from the University of Franca, officials said. The injured were taken to hospitals in the region.

Local television stations broadcast images from the crash scene showing the bus, its left side completely destroyed in the collision.

Gov. Tarcísio de Freitas declared three days of official mourning in the state of Sao Paulo, where the accident occurred.