Congolese security forces on Tuesday tried to slow the advance of Rwanda-backed M23 rebels who say they have captured Goma after entering eastern Congo's largest city, as U.N. officials reported violence,

M23's last occupation of Goma was short-lived, and within a year they were a defeated force. This time, things are different.

Protesters have attacked embassies in the Democratic Republic of Congo's Kinshasa over Rwanda-backed rebels fighting in Goma. Elian Peltier, an international correspondent for The New York Times, joins CBS News with the latest.