The accident occurred near Perinthalamanna, said State Transport Minister Aryadan Mohammed. There were 42 passengers on board at the time. The site of the accident is about 450 km from state capital Thiruvananthapuram.
The dead included the bus driver and 11 women, seven of them students.
The state transport minister, who hails from Malappuram district, told reporters that the accident occurred because of overspeeding.
"We have been told that 13 people have died and numerous others are injured. Chief Minister Oommen Chandy and I are reaching the district later tonight," Mohammed told reporters.
The injured were brought to two private hospitals.
"All arrangements have been made for the treatment of the injured and the autopsy on the 13 bodies would be conducted today itself, so they can be handed over to relatives," local legislator and state Municipalities Minister M. Ali said.
Police have pasted photographs of the victims outside the hospital to help relatives identify their kin.
--IANS (Posted on 06-09-2013)