PHILADELPHIA — Jurors in the federal bribery trial of Philadelphia City Councilmember Kenyatta Johnson said Monday that they had reached an impasse and have been unable to render a unanimous verdict after more than 18 hours of deliberations. But U.S. District Judge Gerald A. McHugh asked the panel of eight men and four women to keep trying, ordering them to report back for a fourth day of debate Tuesday. “I am not prepared simply to end the process,” the judge said before dismissing the panel for the day just before 4 p.m. The jury’s note raised the specter that after weeks of testimony and ye…
