Colombian authorities say six people have died in a turbulent southern region when a bus was attacked and caught fire. They suspect leftist rebels.

Narino state Gov. Antonio Navarro tells The Associated Press that the bus driver apparently did not stop when attackers opened fire along a highway in the municipality of Ricuarte.

Navarro says two children, the driver and three other adults died in Friday's attack. Police say about 25 passengers managed to escape.

Navarro says it appears that the Revolutionary Armed Forces of Colombia were responsible.

Leftist rebels, far-right militias and drug traffickers are active in the area, where the coca leaf that is the basis for cocaine is grown and labs produce the drug.