Twenty-one pilgrims were injured when a tourist bus, coming from Tripura, overturned near Islampur in North Dinajpur district of West Bengal on Thursday, a senior police officer said.
The bus, with 63 on board, turned turtle at around 4:30 am, trapping the passengers, who were rescued by locals.
Condition of four of the 21 injured is stated to be critical and they have been taken to North Bengal Medical College and Hospital, SP PK Sanyal said adding three women were among the seriously wounded. The 17 others, including four women, were being treated at Islampur Sub-Divisional Hospital, he said.
Some other passengers also suffered minor injuries but they were all discharged after being given first aid.
Preliminary investigations suggested that the bus driver could have dozed when the mishap occurred, he said.