"Wicks said the shot sounded as if it came from near a light post at the edge of the woods, which separate the Ponderosa parking lot from a new access road for construction crews building a Wal-Mart. Police surveyed the access road and said they hoped to recover tire impressions. Police were also investigating the possibility the shooter may have used a bicycle and toted his weapon in a backpack to and from the scene, a law-enforcement official at the scene said on condition of anonymity."