At least seven people were killed in an blast in an explosives factory in Indore, Madhya Pradesh in central India Thursday, reported Indo-Asian News Service. At least four people were injured in the blast that took place between 13:15 and 13:30 p.m. local time at Kamla Nagar in Indore, said the report quoting police sources. \"The total number (of death) may go up to 10 as several of the injured are critical,\" senior superintendent of police D. Srinivas Rao was quoted as saying by the report.