Security camera footage shows take-off and crash of Air India plane in Ahmedabad
www.yahoo.comSecurity camera footage accessed and verified by the Associated Press showed Air India flight 171 bound for London taking off and crashing into a medical college in the northwestern city of Ahmedabad on Thursday, killing more than 180 people in one of India's worst airline disasters in decades.

It’s really counter-productive to play armchair air crash investigator.
A little speculation has never hurt anyone, especially when everyone is just saying that it is likely.
No one in this thread said that this is definetly what happened, so I don’t get what you want.