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.

Advances being made by the M23 rebel group in the Democratic Republic of Congo are "heightening the threat of a regional war," according to U.N. Secretary General Antonio Guterres.

Thousands of people have fled their homes in the east of the Democratic Republic of Congo, as clashes between M23 rebels and government forces intensify. The Rwanda-backed armed group has captured a string of towns over the last few days,