Bathinda, June 27 -- Four weeks after five migrant workers were killed and 27 others sustained injuries due to a blast at an illegal cracker factory at a Muktsar village, the cause of the explosion is still unknown as forensic experts have not submitted the analysis report.

Investigators said on Thursday that a resident of Shamli in Uttar Pradesh, Nikunj Goyal, has been identified as the main supplier of the raw material used in the cracker production unit located at Fatuhiwala village.

They said that as Nikunj is evading arrest, it is not known how he procured a huge volume of explosives and other material used in producing firecrackers.

Muktsar superintendent of police (investigation), Manmeet Singh Dhillon, said that Nikunj supplied...