Scientists studied hundreds of gorillas spotted in forest clearings in the Republic of Congo.
Marcel Pika, a naturalized U.S. citizen, was detained in 2016 following the bloody aftermath of Republic of Congo's presidential election.
Mass protest remains peaceful as demonstrators fear President Joseph Kabila will cling to power rather than stepping down in December.
The president won Sunday's election with more than 60 percent of the votes, according to a minister.
The bodies might belong to people killed in anti-government protests in January.