Five rangers and their driver have been killed in the Democratic Republic of Congo’s Virunga National Park, AFP news agency reports.
The park, which is famous for being home to gorillas and other endangered species, is Africa’s oldest and was established in 1925.
A spokesman for Virunga, Joel Malembe, told AFP that the rangers were ambushed while driving near the Ugandan border.
The team’s leader survived, though he was wounded in the attack.
Virunga spans 7,800 kilometres (3,011 miles) and runs along the border with Uganda and Rwanda.
Lions, elephants and hippos share the site with the gorillas but they come under frequent threat from poachers.