NEW DELHI, Dec. 24 (Xinhua) -- At least eight people were killed and many injured in a massive pile-up of as many as 50 vehicles, including a school bus, trucks and several cars, due to dense fog in India's northern state of Haryana early Monday morning.

The accident happened on a highway connecting the Rohtak and Rewari districts of Haryana, near a flyover in Haryana's Jhajjar district.

All the eight killed, including seven women, were travelling aboard the same vehicle which was heading towards Delhi from Rohtak, said local media reports.

Those injured have been admitted in nearby hospitals where they are being given required medical treatment.

Ten of the injured are said to be in critical condition.

Large parts in northern India are currently witnessing dense foggy conditions, particularly during morning and evening hours.

The situation is further aggravated due to the prevailing high levels of air pollution.