A forensic report with the National Investigation Agency (NIA) has said that “arsenic sulphide” was the primary material used in an Improvised Explosive Device (IED), which was found by the rail track at Ghorasan in Bihar on October 1 last year.

• The chemical is mostly used in firecrackers and was used to make a pressure cooker bomb, which was detected and defused in Ghorasan, along the Nepal border.