The fall of Goma, the capital of North Kivu province, saw deadly clashes and added to an already dire humanitarian situation.
The M23 has since advanced towards the neighbouring province of South Kivu, threatening its main city, Bukavu.
Vincent Kasali, a bean seller in Bukavu, said that trade in the city had been disrupted, especially with navigation on Lake Kivu bordering Rwanda restricted.
“We hope that navigation on the lake will resume so that we can find the means to feed our children,” he said.
“We see many soldiers on the road,”
A local source in Bukavu told AFP that the city “remains calm for the time being”.
But the source added that information suggested that the M23 “is reorganising with reinforcements and arms shipments to probably go to the front now that fighting has ended in Goma”.