Forensic experts say presence of fire crackers led to rapid spread of the blaze in the gutted bogie of Tamil Nadu Express, in which over 30 passengers were charred to death last month. A senior forensic scientist of the team that collected burnt articles from the bogie, said they had found fire cracker material from the bogie which indicates that burning of crackers rapidly spread the fire .The fire crackers or its powder seems to have been stored below at least six seats in the coach, he said.

The team of Andhra Pradesh Forensic Science Laboratory (APFSL) experts, who examined the gutted S-11 bogie of Tamil Nadu Express, submitted a report in this regard to the Railway authorities yesterday, the official said.

Thirty-two passengers were charred to death and 25 others injured when a fire broke out in S-11 coach of the New Delhi-Chennai Tamil Nadu Express on July 30 near Nellore district of Andhra Pradesh.