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Police and federal agents were scouring the charred site of a Christmas Day explosion in Nashville on Saturday, trying to determine how and why a motor home blew up and injured three people in the heart of America’s country music capital. The fiery blast, heard from miles away, destroyed several vehicles, damaged more than 40 businesses and left a trail of glass shards around the area. The motor home, parked on a downtown street of Tennessee’s largest city, exploded at dawn on Friday moments after police responding to reports of gunfire noticed the recreational vehicle and heard an automated message emanating from it warning of a bomb. The means of detonation and whether anyone was inside the RV when it blew up were not immediately known, but investigators were examining what they believed...