Two people, including a minor girl, were injured on Tuesday in Allahabad district when a grenade went off at a scrap shop, police said.Scrap dealer Maqsood and Tejal alias Reena were injured this afternoon when the former was trying to extract metal from a grenade, they said.The injured were admitted to district hospital, where condition of Maqsood, whose one arm was blown off in the explosion, was stated to be serious.