Rebel fighters took Uvira city. Uvira is a port city. This is bad for peace talks. A peace deal was signed. The United States helped make it. Leaders from Congo and Rwanda agreed.
Uvira is on Lake Tanganyika. It is a busy trade place. It is near Burundi's capital. Fighting is now close to another country. Congo officials say many people died.
This is a big problem. Many thought peace was coming. The presidents of Congo and Rwanda met. They wanted to stop fighting. They have resources in eastern Congo.
Rwanda agreed to stop helping rebels. The M23 rebels are one group. M23 did not sign the deal. They are fighting more now.
The United States is unhappy. A US Ambassador said Rwanda makes things worse. Experts say Rwanda helps M23. Rwanda says this is not true.
Rebels might want a better spot. A professor said this attack stops peace talks. M23 rebels say they took the city. They think more land helps them. The peace deal is broken. The US will act against those who stop peace. Uvira's capture makes the future unclear.