"There is no blast here today. It's just a few small firecrackers which went off because of the extremely hot and dry weather in West Midnapore district. It happened at around 2 PM," district Superintendent of Police Bharati Ghosh told PTI.
These firecrackers were seized from the factory and kept for reference for probe into last week's explosion, she said.
There was no report of anybody being injured in the incident and ample police force is guarding the factory, Ghosh added.