KINSHASA, Congo — The Trump administration expressed dissatisfaction with the partial withdrawal of the Rwanda-backed M23 rebel group from Uvira, a strategic town in eastern Congo, as residents reported ongoing clashes on Tuesday, a senior U.S. official told Reuters.

M23 seized Uvira, near the Burundi border, on December 10, shortly after Congolese President Felix Tshisekedi and Rwandan leader Paul Kagame met President Donald Trump in Washington to reaffirm a U.S.-brokered peace deal. The capture marked the rebels’ largest advance in months, heightening fears of regional spillover from fighting that has killed thousands and displaced hundreds of thousands since January.

Following concerns raised by U.S. Secretary of State Marco Rubio that Rwanda’s actions in mineral-rich eastern Congo violated the peace agreement, M23 pledged last week to withdraw from Uvira to allow peace talks to proceed. While most combatants have left the town itself, Washington is “not satisfied” that the group has fully withdrawn, the official said.

“There has been some movement, but we don’t feel that it really amounts to a complete liberation of the town. We do believe that the M23 continues to be positioned around the city,” the official added.

Two residents said some M23 fighters remain in Uvira, wearing police uniforms instead of military ones. Sporadic gunfire was heard from hills overlooking the Kalundu neighborhood on Tuesday morning. Sources from both M23 and the Congolese army blamed each other for the recent violence.

Rwanda denies backing M23 and has attributed the renewed fighting to Congolese and Burundian forces, although a United Nations report in July indicated that Rwanda exercised command and control over the rebels. M23 is not party to the Washington-mediated negotiations but is negotiating separately with Kinshasa in Qatar.

The recent fighting has displaced over 84,000 people into Burundi this month, overwhelming the neighboring country’s capacity, the U.N. refugee agency said. In South Kivu province, roughly 500,000 people have been displaced since early December, prompting the World Food Programme to scale up aid for 210,000 vulnerable individuals.