The death toll rose to 14 on September 4 following a collision between four vehicles Friday in Nelspruit, northeast South Africa's Mpumalanga province, local media reported.

Nine people including two children died and 13 others were critically injured when a truck en route to Kanyamazane near Kamagugu township was overtaken by a tow truck which collided with a Toyota Corolla going in the opposite direction.

Four people died later at a local hospital on Friday night and another person had died on Saturday morning, the South African Press Association said on Saturday, citing Mpumalanga police spokesman Benjamin Bhembe.

Bhembe said a case of culpable homicide had been opened but nobody had been charged as yet.

"We don't know who should be charged. It is difficult to say who was really at fault so we are still investigating," he said.

South Africa experiences more than half a million traffic accidents a year, or 1,370 a day, and they cost the country more than 13 billion rand (2 billion US dollars) a year, according to statistics of the Department of Transport.

The road accidents kill an average of 10,000 people a year, and about 80 percent of the accidents are caused by driver-related factors, the department said.