The officials said the violence, between the Bununu and Batende groups in and around the town of Yumbi in Mai-Ndombe province, flared a few weeks before the country’s presidential election on December 30.
As the need for help in containing the outbreak grows, two of the world's most prominent medical journals this week published statements by global health experts urging the Trump administration to do more.
Ebola spreads through contact with the bodily fluids of its victims. The health ministry said 73 patients had received new experimental treatments. Of them, just over half recovered, 20 were still in hospital and the rest died.
Another 100 suffered serious burns in the crash that took place in the village of Mbuta, about 130 km (80 miles) from the capital. Roads in the central African nation are notoriously bad after years of war and neglect.
WHO's emergencies chief has said the insecurity, public defiance about vaccinations and politicians fanning fears ahead of elections in December could create a "perfect storm" leading this outbreak to spread.