What is happening in Eastern Democratic Republic of Congo with the M23 rebels?

The M23 armed group, reportedly backed by Rwanda, has captured Bukavu's main airport and is advancing toward the city itself, which is the capital of South Kivu province. This offensive has forced hundreds of thousands of people from their homes and created a humanitarian crisis that the UN and European countries warn could spark a wider regional conflict. Amid the escalating violence, the United Nations World Food Program reports that nearly 7,000 tons of food have been looted from a warehouse, further exacerbating the humanitarian situation. The UN has documented human rights violations including looting and summary executions as the security situation continues to deteriorate.