The U.N.'s top human rights body agreed Friday to a text presented by Congo that “firmly condemns” support of rebel fighters by neighboring Rwanda in eastern Congo. It also orders the creation of a team of experts to examine rights violations in the region.

A conflict that has raged for decades reached a flashpoint this week when rebels backed by Rwanda marched on a key Congolese city in a bid to occupy territory and exploit minerals.

The Rwanda-backed rebels who captured a major city in eastern Congo have sought to reassure its residents about their safety

Officials and residents say Rwanda-backed rebels have gained ground in eastern Congo despite the unilateral ceasefire they declared earlier this week, taking control of a town 100 kilometers (60 miles) from the provincial capital of Bukavu.