The crude explosive material detected in the cargo hold of Kingfisher flight was not of high density but could have exploded during flight due to air pressure, police said.
According to a first information report (FIR), based on forensic analysis of the material, the material was a mixture of pottassium chlorite, ammonia and sulpher.
Though it could not go off on its own, the possibility of it bursting due to air pressure during flight could not be ruled out, the FIR, to be filed shortly in the Judicial First Class Magistrate Court here, said.
A team led by city police commissioner M R Ajaya Kumar, returned here today after preliminary investigations at Bengaluru airport from where the flight originated.
All employees who were engaged in connection with the flight have been questioned and close circuit TV footages at the airport were scanned by the team.
Though the investigators are yet to find out from where the explosive was planted, a possibility could be that it could a trial run by some militant outfits, police sources said.
The ground-handling staff in Thiruvanthapuram airport were also questioned.
The Bangalore police, Civil Aviation Department and central intelligence agencies were also involved in the probe in view of the seriousness of the case.
The probe would be looking into all aspects of the case such as how and where the material got into the aircraft,where was it contrived and from where the substances were purchased, police said.