NEW DELHI (AP) — At least 32 people were killed on Saturday after a passenger bus veered off a bridge and plunged into a river in the western Indian state of Rajasthan, police said.

Another 10 passengers were injured in the crash in the Sawai Madhopur district of Rajasthan state, 375 kilometers (235 miles) south of New Delhi, said government official K.L. Katara.

The speeding bus was trying to overtake another vehicle when it rammed through the bridge railing, said B.L. Soni, a top police officer.

Police are investigating what caused the driver to lose control of the bus. It wasn't clear if the driver survived, or how many people were aboard the bus.

Rescuers have so far recovered 32 bodies from the river.

The bus was on its way to Lalsot, a town in Rajasthan, after picking up passengers from the Sawai Madhopur railroad station when it crashed around 6 a.m., said police officer Narain Singh.

Driver fatigue, negligence, poor quality roads and vehicle maintenance are the usual causes of such accidents in India. Police figures show India has the world's highest road accident death toll, with more than 110,000 people dying each year in crashes.