A deadly plane crash in Elko, Nev., killed at least four people late Friday night, a Federal Aviation Administration spokesman confirmed.

Allen Kenitzer says that a Piper PA 31 airplane — a small passenger aircraft — crashed under unknown circumstances, the Associated Press reported. The crash caused multiple explosions and flames near a casino, supermarket and a housing complex in the city, the Elko Daily Free Press added.

Dr. Rodney Badger, a cardiologist in Elko, told the Elko Daily Free Press that an American Medflight plane was transporting a heart patient to the University of Utah.

“There was not a lot left of the aircraft,” Elko Fire Chief Matt Griego was quoted as telling the Elko Daily Free Press after the flames were contained near the complex

The FAA and the National Transportation Safety Board will continue to investigate.