Some 14 people have been killed when 300 militiamen attacked a town in north-eastern Democratic Republic of Congo, the UN says.
Four people were shot dead and another 10 burnt in Lengabo town, UN spokeswoman Rachel Eklou told the BBC.
Lengabo is in Ituri, one of DR Congo's most volatile districts, where UN peacekeepers were deployed last year to quell clashes between ethnic militias.
Some 150 UN troops have been sent to Lengabo, Ms Eklou said.
She told the BBC Focus on Africa programme that an ethnic Lendu militia had attacked the town, populated by the Bira community.
Some 91 houses were burnt in Lengabo, 10km south-west of the district capital, Bunia, Ms Eklou said.
The Lendus have been fighting their Hema rivals for many years in Ituri but Ms Eklou said they had not previously had any problems with the Biras.
Some 50,000 people have been killed in Ituri since 1999, but the level of violence has been reduced since 4,000 UN peacekeepers were deployed in the region last year.