On 29 May 1975, about 10,000 Hmong people, attempted to cross Hin Heup bridge traveling to Vientiane.
As the group crossed the bridge Pathet Lao forces open fire on the column using mortars, M16s, and bayonets.
Many people jumped into the river to flee the firing troops, by the end of the massacre 14 civilians were killed and over 100 wounded.
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