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Thongsangnang village, Chanthabouly district, Vientiane, Lao PDR


UXO Problem

The Unexploded Ordnance (UXO) Problem

Lao PDR has the unwanted distinction of being per capita the most heavily bombed nation in the world. Between the years 1964 and 1973, the United States flew more than half a million bombing missions, delivering more than two million tons of explosive ordnance, in an attempt to block the flow of North Vietnamese arms and troops through Laotian territory. The ordnance dropped include more than 270 million submunitions (known as “bombies” in Laos) released from cluster bombs.

Significant land battles, including those during the war for independence during the French colonial era and between the Pathet Lao and the Royal Lao forces, also contributed vast quantities of unexploded heavy bombs, rockets, grenades, artillery munitions, mortars, anti-personnel landmines, and improvised explosive devices.

It is estimated that up to 30% of all explosive ordnance did not explode. Such unexploded ordnance (UXO) continues to remain in the ground, maiming and killing people, and hindering social-economic development and food security.

Statistics of Unexploded Ordnance

In excess of 270 million

Estimated number of ordnance dropped over Lao PDR between 1964 and 1973.


Estimated failure rate of ordnance under ideal conditions.

80 million

Estimated number of ordnance that failed to explode.

Over 1,700,000 or 2.15%

Number or percentage of estimated unexploded ordnance destroyed by UXO Lao from 1996 to 2020.

Lao National Unexploded Ordnance Programme


Contact Us

UXO LAO, P.O. Box 345, Vientiane , Lao PDR
Tel: (+856-21) 225023-4
Fax: (+856-21) 225025
E-mail: uxolao@uxolao.gov.la