The investigation into the Air India Express plane crash in Kozhikode that killed 18 people will take some time to complete, the airlines said on Sunday. 16 passengers and the two pilots were killed when a Boeing 737 flight from Dubai overshot the tabletop runway during landing at the Kozhikode airport in heavy rain on Friday. The plane, which had 190 people on board, fell into a valley 35 feet below and broke into two.

The Aircraft Accident Investigation Bureau has initiated an investigation with the support of Flight Safety Officials and it will take some time before it is completed, the airline said.

Air India Express also said that the mortal remains of the 16 passengers killed in the accident have been handed over to their families. The mortal remains of pilot-in-command Deepak Vasanth Sathe were taken from Kozhikode to Cochin and then to Mumbai by a flight, the airline said in a statement.

Sathe’s family was also escorted to Mumbai on the same flight.

The mortal remains of co-pilot Akhilesh Kumar were cremated “with attendance from all family members as well as with the officials of Air India and Air India Express present to mark respect to the departed soul at Mathura, his hometown,” it said.

A total of 149 people have been admitted to hospitals. Twenty-three have been discharged, while three are critically injured, Civil Aviation Minister Hardeep Singh Puri said Saturday after his visit to Kozhikode Medical College, where many of the passengers were admitted.

Air India Express is a wholly owned subsidiary of national carrier Air India.