A selfie taken by Dr Prateek Joshi onboard the flight, showing the smiling family, has gone viral, capturing their excitement for the journey ahead.
The Chandigarh police lodged the FIR on Wednesday late night in connection with the clash in which around 30 policemen, including the Rapid Action Force personnel, were injured while several police vehicles were damaged.
Interfax, citing police, said that investigators had tentatively concluded that a natural gas canister had blown up. It said that the blast was followed by a fire.