The fire erupted at the warehouse owned by Maruf Ahmed around 12pm, said Saiful Islam, duty officer of Keraniganj fire service adding that the roof of the tin-shed warehouse was blown away following the blast.
The fire also gutted two other adjoining warehouses, said the official.
On information, two firefighting units rushed in and doused the fire with the help of locals within 30 minutes.
At least 10 people were injured while they were trying to douse the blaze.
Besides, around 30 adjoining houses were partially damaged in the fire, said the fire service official.
Meanwhile, a three-member probe committee, led by upazila nirbahi officer Amit Debnath, has been formed to investigate the incident.
Locals alleged that there are at least 50 chemical warehouses in 12 residential areas, including Atasur, Kalindi, Dakpara and Chunkutia for which they are passing daysamid risks.
After the incident, the warehouse owner went into hiding, said Moinul Islam, officer-in-charge of Keraniganj Police Station.