Attingal police said they have registered a case against the licensee, Surendran, who had stored about 150 kgs of crackers and fireworks material at the storehouse without valid permission.
Surendran had license to store only about 15 kg, police said.
"It is a clear violation of license. So far no arrests have been made," police said.
Meanwhile, forensic experts, police and fireforce took evidence from the accident spot.
In one of the worst tragedies to hit Kerala, 100 people were killed and 383 injured in the major fire that engulfed the 100-year-old Puttingal Devi Temple complex near here during a display of fireworks, for which no permission had been granted by the authorities.