ANCHORAGE, Alaska (AP) — A plane crash in Alaska injured four people but the National Transportation Safety Board has delayed normal investigation procedures over concerns about the coronavirus. Authorities say a couple and their two adult sons were the only people on the airplane and were transported to a hospital following the crash in the Fire Lake area north of Eagle River around 8:30 p.m. Saturday. NTSB Alaska Regional Chief Clint Johnson says the agency was not immediately able to send investigators to the crash site due to concerns over COVID-19. The agency is investigating remotely with the Anchorage police and fire departments.