Morristown Airport was closed Saturday morning after a private plan carrying four people rolled off the runway after landing, officials said. No one was reported injured, police said. The Learjet 45 rolled off the runway at 11:30 a.m. after arriving from Fulton County Airport in Atlanta, according to the Federal Aviation Administration. The FAA said it is investigating the incident. The agency said it does not identify people involved in aircraft incidents or accidents. Morristown police said they are “still assessing details and will provide an update once additional information is available….