In his representation to Home Minister Rajnath Singh, the Rajya Sabha MP said, "I am sure that it is not fireworks explosive material but something else which can be found out by the central investigation agency. I am sure that if NIA goes on for investigation, some truth will come out."
Twelve persons were charred to death and four others injured in an explosion at an illegal firecracker factory at Pingla in West Midnapore district.
Earlier, the state BJP had also requested the Centre to investigate the matter "apprehending a bigger terror plot". BJP state President Rahul Sinha met Prime Minister Narendra Modi during his visit to Kolkata last week demanding central investigation into the case.