Rwandan-backed M23 rebels who in late January captured Goma, the biggest city in eastern Congo, have since been advancing around one of Africa's great lakes, Lake Kivu, towards the second-biggest city in the area,

In a statement on social media, a spokesperson for the M23 rebels said the group was in control of Kavumu airport in South Kivu province - a key strategic location for the Congolese army - and surrounding areas.