HARRISBURG, Pa. (AP) — The FBI is investigating how Gov. Tom Wolf’s administration came to issue permits for construction on a multibillion-dollar pipeline to carry natural gas liquids across Pennsylvania, The Associated Press has learned. FBI agents have interviewed current or former state employees in recent weeks about the Mariner East pipelines, according to three people who spoke on condition of anonymity. Wolf’s administration has said in the past that the permits contained strong environmental protections.