Four persons were killed in an accident involving a private bus and a motorcycle in Haryana's Yamunanagar district on Saturday, police said.Three of the victims were riding the motorcycle while the fourth was a passenger on the bus, which overturned after hitting the motorcycle.The accident took place on the Jagadhri-Bilaspur road, around 90 km from here. The private bus, carrying pilgrims from Punjab, was returning from the Kapal Mochan religious fair in Bilaspur.A police officer said that five other bus passengers were also injured after the bus overturned. The injured were to rushed to nearby hospitals.