Rebels in the Democratic Republic of Congo on Sunday entered the vital trading hub of Bukavu in the east of the country, according to the fighters and videos circulated by local residents. If confirmed, Bukavu would be the latest city to fall in a sweeping offensive that has revealed the weakness of the crumbling Congolese army.

The M23 rebels — who are supported and directed by Rwanda, Congo’s much smaller neighbor — appeared to meet no resistance, residents said, as they marched into Bukavu, a provincial capital that is a major center for gold trading and smuggling.

“We’re there, we’re there in Bukavu,” said Willy Ngoma, a M23 spokesman reached by telephone.

On Sunday, the rebels addressed a crowd of people in Bukavu’s main square after they entered the city in long, silent columns, according to three eyewitnesses and videos shared on social media and verified by the Times. The eyewitnesses requested anonymity for fear of retribution from the armed group.

Days earlier, Congolese soldiers had fled the city in similar columns. The Congolese government has not spoken publicly about the situation in the city Sunday, and the capture of Bukavu has not been independently confirmed.

The apparent fall of Bukavu would stand in sharp contrast to the protracted battle for the key city of Goma last month, in which nearly 3,000 people were killed, according to the United Nations.

With the capture of Bukavu, a city of more than a million people that sits on the edge of a crystalline lake, the M23 rebels would now control the two largest trading hubs in Congo’s mineral-rich east.