The vehicle was carrying tourists from Kibumba in the city of Goma. One park ranger was killed and three other people, including the British citizens, were abducted.
A park ranger at Virunga National Park in the Democratic Republic of the Congo was killed and at least three people, including two British tourists, were kidnapped Friday, park officials said.
"I confirm an attack on our convoy", Joel Wengamulay, the park spokesman said, without specifying if tourists were targeted or had been kidnapped.
The UK Foreign and Commonwealth Office said it was in contact with DRC authorities on the incident and was providing support to families of the victims.
"With Virunga National Park being within our zone of action, we have joined the park rangers for search operations for the people taken hostages", Major Guillaume Kaiko Ndjike, the army's spokesman in North Kivu, said on Saturday.
The area, known for its mountain gorillas, has seen a number of killings and kidnappings in recent years.
Last year, a fifth of the park's southern sector was deforested owing to illegal charcoal production.
Just last month, on April 9, five park rangers and their driver were killed in an ambush which saw a sixth park ranger injured.
More than 175 rangers have died protecting Virunga National Park, which is located in the rugged mountains and volcanic plains adjacent to neighbouring Rwanda and Uganda.
The Foreign Office has issued warnings not to travel to large parts of the DRC.
It says those travelling without an escort "risk of kidnap or injury as a result of armed or criminal activity remains high".
It said that United Kingdom government staff are not always in the area and the British embassy's ability to offer consular assistance may be "severely limited".