NORMAN - The FBI has found no evidence so far that a University of Oklahoma student who died in a bombing Saturday night tried to get inside the football stadium or had ties to any terrorist organization, officials said Tuesday. The FBI also has found no evidence anyone else was involved, officials said. Still, OU plans to tighten security at upcoming football games. Fans can expect bags and purses to be checked more closely. “They should come a little earlier,†OU President David Boren said. “Be patient with us - know it’s only for their safety that we’re being very,...