Vietnamese and US administration officials hold a groundbreaking ceremony to mark the start of a joint US-Vietnam Agent Orange clean-up project.
The US Air Force sprayed millions of liters of the chemical over South Vietnam during the war to destroy guerrilla fighters' jungle cover.
Contamination from dioxin, a chemical used in Agent Orange, has been linked to cancer and birth defects and was for years a sensitive topic between the former foes as diplomatic and economic relations have since improved.
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