If 4 people were killed then why did 17 dead body bags reach the post mortem house? How many people died in Mathura Yamuna Expressway accident?

Mathura. There was a sudden scream between 4 am and 5 am on the Yamuna Expressway in Mathura, Uttar Pradesh. The reason was a major road accident due to dense fog. According to the information given through the district administration, 4 people died and 23 people were seriously injured in this accident. But an injured person in this accident told that 10 to 11 people got burnt in the bus in front of him. After which a big question arose regarding the number of dead. Now news is coming out that the bodies of those who died in the accident have reached the post-mortem house. But the surprising thing is that where the administration was confirming the death of 4 people, why 17 dead bodies have reached the post mortem house.