They said a massive search operation has been launched to trace any weapon or explosive that it might have dropped.
The condition of over two dozen people who were admitted to the hospital in Kathmandu is said to be serious.
The Dhaka to Kathmandu US-Bangla Airlines flight, with 67 passengers and four crew members on board, caught fire after it careened off the runway and ploughed into a football ground near the Tribhuvan International Airport on Monday.