The Boeing 787 Dreamliner crashed shortly after take off on Thursday in what is one of the deadliest plane accidents in terms of the number of British nationals killed. It struck a medical college hostel in a residential part of Ahmedabad, killing 241 of the 242 people on board.

More than 72 hours after India’s deadliest aviation tragedy in recent memory, Rohit Patel – a father mourning the loss of his two children – stood trembling before a room of Indian health and investigative officials in Ahmedabad and demanded answers.

Indian investigators have recovered the digital flight data recorder or the black box of the Air India flight that crashed a day earlier.