The Rwanda-backed rebel group M23 is battling Congolese government forces in Congo's key city of Goma, causing the international airport there to be evacuated.

Congolese security forces on Tuesday tried to slow the advance of Rwanda-backed M23 rebels who say they have captured Goma after entering eastern Congo's largest city, as U.N. officials reported violence,

Democratic Republic of Congo's M23 rebel group has gained control of the airport in the eastern city of Goma, diplomatic and security sources told Reuters.