Media playback is unsupported on your device

DR Congo: Rebels advance on Goma

14 July 2012 Last updated at 02:54 BST

Rebels in the Democratic Republic of Congo are moving ever closer to the city of Goma.

They've already taken over several towns in the region, and the Congolese army has been unable to stop them.

Now, thousands of United Nations troops are shoring up the city of Goma to try to keep the M23 rebels at bay.

Wendy Urquhart reports.