<p>SKOWHEGAN -- The explosion of two homemade bombs inside Wal-Mart Saturday afternoon sent a store full of holiday shoppers scurrying for the exits. Two acid bombs detonated in two separate aisles as the store was crowded with shoppers around 3:15 p.m. on Saturday, said Sgt. Joel Davis, fire investigation supervisor for the State Fire Marshal's Office. One of the bombs detonated in the pet area. The second was in the store's toy section, Davis said. Early reports indicate that three or four people suffered minor injuries, mostly limited to ringing ears caused by the blasts, but last night investigators could still not rule out that someone may have suffered more serious injuries that had not yet been reported.</p>