"Two of the accused, who were drunk, have been arrested and car has also been seized," SSP, Manzil Saini said.
The incident took place at about 2 AM when 35 labourers were sleeping inside the night shelter and the car rammed into it.
The car was allegedly being driven at a high speed when the accident happened.
Four of the deceased were daily wage earners from eastern Uttar Pradesh's Bahraich district.
The six labourers, who are severely injured, have been admitted to the trauma centre.