India, Jan. 29 -- Four people were killed and five others injured on Thursday morning after a sleeper bus rammed into a parked trailer on the Jaipur-Agra national highway (NH 21), allegedly due to dense fog in Rajasthan's Bharatpur.

Police reached the spot and shifted all injured to the district Raj Bahadur Memorial Hospital, where doctors declared four of them dead on arrival.

Five of the passengers are undergoing treatment in the hospital, Bharatpur Sub-divisional Magistrate (SDM) Bharti Gupta said.

The private sleeper bus was travelling from Kasganj in Uttar Pradesh to Jaipur with 35 passengers.

The deceased were identified as Geeta Devi (38) and her 8-year-old son Kanha from Mathura in Uttar Pradesh, Mukkhan Singh (28) from Alwar,...