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City officials in Nogales, Ariz., are mourning the death of the commissioner of the U.S. Section of the International Boundary Water Commission, Carlos Marin, who died in a plane crash this week along with three others.

Marin visited Nogales on a semiregular basis to work with the city on storm-water and wastewater issues.

He was in Nogales in late July to assess if a barrier that had been built in a tunnel beneath Nogales was in Mexico and if it was the cause of flooding in Mexico.

Marin, Arturo Herrera, commissioner of the Mexican side of the commission, and two others were aboard a plane that had been missing since Monday when it took off from El Paso to check out flooding on the Rio Grande.

The International Boundary and Water Commission said that all four people were found dead in the plane's wreckage Wednesday by the U.S. Border Patrol in a rugged section of the Sierra Madre Mountains in Mexico, about 20 miles northwest of Presidio.