The seizure happened late yesterday at an "opulent, expansive house" in a suburb of the capital, Kampala, where law enforcement officials had been monitoring the West Africans for several weeks, said Gessa Simplicious, a spokesman for the Uganda Wildlife Authority.
A Liberian and two Guinea-Bissau nationals were arrested for possessing the ivory and would face criminal charges.
The ivory likely had been imported from neighboring countries such as Tanzania and Congo because it had markings not familiar to Ugandan authorities, Simplicious said.
Smugglers take advantage of porous borders in Africa's Great Lakes region to move illegal wildlife products around, he said.
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Uganda has about 5,600 elephants still left the wild. Although their numbers have been rising in recent years, elephants face sporadic poaching, sometimes with the help of corrupt wildlife officials.
Uganda's government recently set up a canine unit to help curb the illegal trade in wildlife products.
Africa had 1.3 million elephants in the 1970s but has less than 500,000 today. Experts warn that if the ivory trade is not stopped, elephant populations could plummet.
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