Virunga National Park
"It is the only responsible decision that we can make under the current circumstances," the park's warden said.
"It is unacceptable that Virunga’s rangers continue to pay the highest price in defense of our common heritage."
Gunmen kidnapped the journalist and several others on Friday.
At least 152 Virunga workers have died defending the critically endangered primates over the past two decades.
WHAT'S HAPPENING
More than 150 wildlife rangers have died on the job in the last 20 years.
