Authorities in the Democratic Republic of Congo (DRC) say gunmen have killed at least six rangers in the Virunga National Park, a UNESCO World Heritage Site in the restive east of the country.

There was no immediate claim of responsibility for the attack on Sunday morning but officials blamed Mai-Mai fighters, members of one of the dozens of armed militias battling for control of the DRC’s mineral-rich eastern borderlands.

Sankulleh Janko reports.