This has to be one of the most despicable acts of cowardliness I've ever heard. The BBC are reporting that 200 rebel Mai Mai militia fighters have attacked a nature reserve in DR Congo, killed one ranger, critically injured another three and are now threatening to slaughter a group of endangered Mountain Gorillas if the government try and bring them to justice.

WildlifeDirect director Emmanuel de Merode said the Mai Mai attack may be a reprisal for a government clampdown.

"Our understanding is that this was a deliberate attack on the Congolese wildlife authorities," he told the BBC's Focus on Africa.
[...]
"The efforts of the Congolese rangers to protect these have been quite successful but at a huge human cost."

"Over 97 rangers have been killed in Virunga National Park since the war started in 1996," he said.
Full story at: BBC NEWS - DR Congo rebel threat to gorillas.