Pakistan, July 4 -- At least 40 people were killed and eight others injured on Friday after an overcrowded passenger bus fell into a ravine in a remote district of Pakistan's southwestern Balochistan province, an official said, in one of the deadliest road accidents in recent years.

The fatal accident occurred in Dana Sar, a mountainous area on Balochistan's border with Khyber Pakhtunkhwa province, when the bus with 48 passengers aboard veered off a narrow road and plunged into a 400-feet deep ravine on its way to Peshawar from Quetta.

Road accidents and public safety remain a major challenge in Pakistan's impoverished Balochistan province where reckless driving, poor infrastructure and sharp bends contribute to hundreds of casualties e...