CIUDAD JUAREZ, Mexico -- A Mexican state governor said a small plane carrying the U.S. and Mexican heads of the International Water and Boundary Commission has crashed, killing all four on board.

The governor of Chihuahua says the Cessna 421 was found Tuesday near the town of Ojinaga, across the border from Presidio, Texas.

He said U.S. commissioner Carlos Marin and his Mexican counterpart, Arturo Herrera were both killed, along with the pilot and Jake Brisbin Junior, who was the executive director of the Rio Grande Council of Governments.

The plane disappeared Monday during a flight over the Luis Leon Reservoir in northern Mexico. The officials made the flight to get an aerial view of floodwaters that are threatening levees on both sides of the border.