The deceased have been identified as Krishan, his wife Kaushalya Devi and son Rakesh alias Raju, residents of Hardev Nagar in Delhi, while the injured, Sushil and his wife Manju have been admitted to PGIMS in Rohtak where their condition is stated to be critical, police said.
The mishap occurred when the victims were returning to Delhi from Rohtak after attending a wedding function there.
Krishan, Kaushalya and Rakesh reportedly died on the spot while Sushil and Manju suffered serious injuries.