Four persons, including a woman and child, were killed on Monday morning when a car collided with a bus due to thick fog in Punjab's Tarn Taran district, police said.
Three people were injured in the accident. There were seven passengers in the car. The accident took place near Harkie Patan, on the highway connecting Amritsar with Moga town.
Police officials said that the impact of the collision was such that it took nearly two hours for police and local authorities to recover those from inside the vehicle.
Met officials here said that thick fog had engulfed several parts of Punjab and Haryana on Monday after a gap of few days.
Visibility in Amritsar, ludhiana and Patiala in Punjab and Karnal and Ambala districts in Haryana was reduced to less than 50 metres. Road and rail traffic were hampered in both states.
Arrival and departure of at least 10 flights to and from the Guru Ram Das Jee International Airport at Amritsar was delayed.