A mass shooting that left 12 people wounded Saturday afternoon at a summer festival in Ohio stemmed from “a dispute involving two rival groups,” according to police. Shots rang out from two gunmen, one from each group, just after 5:30 p.m. near the Old West End Festival in Toledo. A dozen people were hurt, with the oldest victim being 61 and the youngest 14, police Lt. Dan Gerken said Saturday, noting most were in their early 20s. Toledo Police Chief Michael Troendle said Tuesday that a dispute between rival groups led to “a foot chase” and a physical altercation in...