Police are investigating another attack on the Monon Trail. A man said he was beaten while walking his dog near 61st Street at about 6 a.m. Thursday morning. The victim said two men attacked him from behind, knocked him down and hit him in the face. They searched his pockets but took off when they found nothing. Last week, a man was shot on the Monon near 86th Street. Devon Moore, 16, was arrested and charged with attempted murder and attempted robbery in that incident.