Rwanda-backed M23 rebels faced pockets of resistance from army and pro-government militia overnight after entering eastern Congo's largest city Goma in the worst escalation of a conflict that has run for more than a decade.

In the capital, Kinshasa, protesters complaining of a lack of international action attacked foreign embassies, including those of the U.S., France and Rwanda.

U.N. humanitarian office spokesperson Jens Laerke told a briefing Tuesday that hospitals in Goma were overwhelmed. The World Food Program said it temporarily paused food assistance activities in the Goma area.