Gunmen killed two rangers in Congo's Virunga National Park on Sunday, the Congo Institute for Nature Conservation (ICCN) said in a statement, the second attack this month in the country's restive east.
Almost no kidnappings were recorded in the last month and there were 43 gang-linked murders, down from 146 in the first three weeks of April, a human-rights group said.
Former Rwandan police officer Fulgence Kayishema, accused of ordering the killing of some 2,000 Tutsis who were seeking refuge in a church during the 1994 genocide, appeared briefly in a South African court on Friday and was remanded in custody.
Three-year-old Madeleine McCann, from Rothley, Leicestershire in central England, disappeared on May 3, 2007 during a holiday with her parents in the Algarve region of southern Portugal.
A Rwandan man accused of ordering the killing of some 2,000 Tutsis who were seeking refuge in a church during the 1994 genocide has been arrested in South Africa, a U.N. war crimes tribunal and South African police said on Thursday.