Authorities are continuing their hunt for two fugitives in the Ozark National Forest, using tracking dogs and aircraft to aid in the search. State police put the dogs on the same trail Wednesday morning where the animals picked up a scent the day before. Later this morning, police said the scent trail had weakened. The search remained focused on 50 acres in Van Buren County where officers say they believe the men are hiding. State police spokesman Sergeant Pete Westerman says the effort has evolved into more of a manhunt than a search. Forty-nine-year-old Mark Holsombach and 28-year-old William J. Frazier became the target of the manhunt after a shot fired from their hut Monday morning hit Trooper Charlie Edmonson in the arm. Police say they also wanted to ask the pair about two neighbors who have been missing for several weeks -- 46-year-old Theodore R. Throneberry and his wife 45-year-old Ann Ryberg Throneberry. Today, police say they found an all-terrain vehicle belonging to the Thornberrys. The four-wheeler was within the 50 acre search grid.