John Hume was allegedly part of an international rhino horn trafficking syndicate, prosecutors say.
Two teens, aged 16 and 18, have been arrested over the attack as police search for a third suspect.
The gunmen stormed a mosque in what an official has described as a "reprisal attack".
Attacks were carried out in more than a dozen villages last month, Human Rights Watch says.
Uganda and Honduras have agreed to accept migrants of other nationalities who have been deported from the US, CBS reports.
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