Laden with just the possessions they can carry, thousands of displaced people have reached the outskirts of the city of Goma in eastern Democratic Republic of Congo, fleeing a rapid M23 rebel advance that has taken more territory than ever before.

Fighting has escalated sharply in recent weeks in eastern Congo, where rebels have seized key towns and are closing in on the city of Goma, the government's last stronghold in the region bordering Rwanda.

Panic spread in Goma on Thursday, with M23 rebels steadily inching closer to the city in eastern Congo as they battle the Congolese army. Bombs were heard going off in the distant outskirts and hundreds of wounded civilians were brought in to the main hospital from nearby towns and villages.