This comes amid concern that the Islamic State group has been trying to strengthen ties with the rebel Allied Democratic Forces (ADF) - an Islamist armed group originally from Uganda.
Congo has experienced several outbreaks in the past, including one in 2009 that infected 214 people and caused 15 deaths, according to the WHO.
The jihadists of the Allied Democratic Forces (ADF) are suspected to have carried out the attack in the Ituri area on Saturday, they said.
The victims were engulfed by a "huge fire sparked by the collision" overnight Saturday in the west of the country, local police captain Antoine Pululu told AFP.
"It is clearly a manoeuvre by those who want to hold onto power," Olivier Kamitatu, Katumbi's spokesperson, told Reuters.
Desire Malodra, a local civil society leader, said 15 people in the Djugu area died on Friday and Saturday in clashes between the DRC army and CODECO militiamen.
The ADF has publicly aligned itself with Islamic State, which in turn has claimed responsibility for some of its attacks. The United States referred to the ADF as “ISIS-DRC” when it added it to its terrorism blacklist.
The virus has killed a number of prominent politicians, and low vaccination rates have left the country vulnerable to more contagious variants.
"Several others were left wounded and 25 people were abducted, while over 70 shelters and stores were set on fire. In Boga town alone, 31 women, children and men were killed," UNHCR spokesman Babar Baloch told reporters in Geneva.
Houses were burned and civilians abducted, the U.N. office for humanitarian affairs said in a statement.
Several minutes of heavy gunfire alerted a group of conservation rangers guarding workers on the scrubby slope above.
Goma sits on the mountain's southern flank and overlooks Lake Kivu.
A historically Ugandan Islamist group, the Allied Democratic Forces is the bloodiest of scores of armed militias that roam the mineral-rich zone, many of them a legacy of two regional wars from 1996 to 2003.
A policeman was killed on Thursday as rival Muslim groups fought over the right to celebrate the Eid festivities marking the end of Ramadan at a major sports stadium, officials said.
Chitenji Kamanga, 28, was killed when the U.N. base in the village of Kilia, was attacked at 13:30 local time, the Malawi Defence Force (MDF) said in a statement.
A spokesman for a monitor called the Kivu Security Tracker (KST) said however that it had counted "only five bodies so far".
Zoe Kabila was stripped of his job as governor of Tanganyika.
Violence has remained endemic in eastern Congo since the official end of the civil war in 2003, but insecurity has soared in the past two years.
The new government of the Sacred Union coalition has 57 members including 14 women, with only 10 from the previous cabinet being reappointed.