FILE - In this March 16, 2016, file photo, a woman holds up a poster with a photo of slain environmental leader Berta Caceres, during a protest march in Tegucigalpa, Honduras. Authorities said that unidentified gunmen killed Nelson Garcia, a colleague of Caceres, who was slain almost two weeks ago in similar circumstances. Honduran authorities announced Thursday, Sept. 8, that they have arrested a sixth suspect in the March killing of environmental activist Berta Caceres. (AP Photo/Fernando Antonio, File)
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