"Two park rangers were killed" on Saturday in a joint attack by the Mai-Mai militia and fighters from the Democratic Forces for the Liberation of Rwanda (FDLR), an ethnic Hutu militia based in eastern DRC, Capt. Guillaume Djike, an army spokesman in the region, told AFP.
The army launched a counterattack and "killed five assailants", he said, adding that the militias wanted to set up in the area to carry out "illegal fishing in Lake Edward."
A statement from park authorities said the two rangers were captured by the rebels "before being summarily executed". A third ranger is missing, it said.
"Four ranger positions on the shores of Lake Edward in the Central Sector were attacked by Mai-Mai militia over the weekend", the statement said.
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"The coordinated attacks were carried out by over 120 rebels, beginning in the early hours of Saturday morning.
It is believed this number represents a new coalition of Mai Mai rebels specifically targeting Virunga's rangers."
"Despite the wide progress we make here in many areas, we cannot sustain these kind of losses in what is still the most dangerous conservation job in the world", he said.
Opened in 1925, during Belgian colonial rule, Virunga National Park is home to several threatened species, including its emblematic mountain gorillas.
The 7,800-square-kilometre UNESCO world heritage site, which borders Rwanda and Uganda, reopened to tourists last year after being closed for two years because of militia violence in the region.