LUCKNOW, Oct. 2 -- Four passengers were killed and four others critically injured when an air-conditioned private bus carrying around 50 people collided with a trailer on the Gorakhpur Link Expressway in Ambedkar Nagar early Friday morning, police said.

Police suspect the driver may have dozed off at the wheel.

According to officials, the crash occurred at around 5.15 am in the Jaitpur police station area, around 50 km from the district headquarters. The bus was travelling from Delhi to Darbhanga in Bihar when it collided with the trailer, which was carrying tiles from Rajasthan to Bihar. The impact was so severe that the left side of the nearly 40-foot-long bus was completely mangled, trapping several passengers inside. Most of the pas...