A small plane crashed on an Atlanta interstate on Friday, killing all four people onboard, officials said. The plane, a Piper PA-32, took off from DeKalb Peachtree Airport and crashed about a mile away, FAA spokeswoman Kathleen Bergen told NBC affiliate WXIA in Atlanta. Grady Byrd of Asheville, North Carolina, told the station that the victims were his son, two grandsons, and the fiancee of one of his grandsons. The flames made it impossible to help the victims, witnesses told The Associated Press. A federal investigator will go to the crash scene Friday afternoon, the NTSB said.