In social media, images are circulating where people are fleeing from the meeting in panic and bloody bodies are lying on the ground in the city of Bukavu.
Among the leaders present were, among others, Corneille Nangaa, leader of a coalition group where M23 is included. He and others were on their way to leave the scene when two explosions occurred, according to a journalist on site.
M23 has swept through the region and taken over important cities and killed thousands of people. In a lightning-fast offensive a few weeks ago, the group took over the largest city in eastern Congo, Goma, and the second-largest city, Bukavu.
M23 has the support of thousands of soldiers from the neighboring country of Rwanda, according to UN experts. The militia has claimed to have set its sights on the country's capital, Kinshasa, which is located hundreds of miles further west.