It is believed they were visiting the world-famous gorilla sanctuary the Virunga National Park.
Two British tourists were abducted, one wildlife park ranger was killed.
Two British citizens have been kidnapped in the Democratic Republic of Congo (DRC), the foreign office has said.
Two British tourists are reported to have been taken hostage in the Democratic Republic of Congo.
The threatened Virunga National Park in DR Congo announced on Thursday it has banned the felling of trees throughout the nature reserve.
"For the moment the Congolese Institute for Nature Conservation can not communicate much about the incident because the hostages are still in captivity".
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Just last month five Virunga rangers and a staff driver were killed during an ambush in the Central Sector of the Park.
Established in 1925, it is home to about a quarter of the world's population of critically endangered mountain gorillas, as well as to eastern lowland gorillas, chimpanzees, okapis, lions, elephants and hippos.
But it is located in DR Congo's North Kivu province, where armed groups are fighting for control of territorial and natural resources, and where poaching is a major threat.
The region has been hit by increasing violence, particularly against national park staff. One female park ranger was "wounded" and was taken to the hospital for treatment.
A few months ago, two United Nations experts were killed by militiamen.
In an interview with National Geographic past year, Virunga National Park Director Emmanuel de Merode said three main groups are responsible for the violence in the park.