, July 3 -- At least 40 people were killed and eight others injured after an overcrowded passenger bus plunged into a rocky ravine in Pakistan's southwestern Balochistan province early Friday, officials said.

The accident occurred in the Dana Sar area, near the border between Balochistan and Khyber Pakhtunkhwa provinces, when the speeding bus went out of control and fell into a deep ravine, according to Shahid Rind, spokesperson for the Balochistan government.

Rind said the bus was carrying more passengers than its capacity after taking aboard people from another bus that had broken down along the route.

Rescue teams reached the scene and began efforts to identify those killed in the crash.

President Asif Ali Zardari expressed deep so...