A blast tore through a piece shop here Monday, killing four individuals, including two passers-by, and harming three, police said. The impact, which occurred in the town Sarvat Road zone, in a split second killed Tazim (50) and Shazad (55), who were taking care of the piece, a police official said. The two others, whose character is as yet being found out, were harmed as they were going by and passed on at the healing facility, Superintendent of Police (City) Ombir Singh said. Three more individuals who happened to going past the shop at the season of the blast were harmed and taken to healing center. The impact occurred when a few people were breaking scrap in the shop, said Circle Officer Harish Bhadoria.