Police in Tennessee say a woman was injured when a gun she carried into a Walmart fired a shot after falling from its holster and hitting the floor. Lexington police Capt. Jeff Middleton says the woman walked into the store with the gun in the holster at her side. He says while she was getting a cart, the gun became dislodged and fell to the ground, reports the AP. The impact caused the gun to go off, sending a bullet to the floor and fragments into the air. The Jackson Sun reports the fragments hit the woman in the leg. She was treated and released at a hospital Thursday. Middleton says she has a gun-carrying permit and that the incident remains under investigation. (More Walmart stories.)