The rebels had said the ceasefire didn't "concern" them as the deal was struck with Rwanda, not M23.
African leaders declare a ceasefire and say the M23 rebels must withdraw from occupied territory or face intervention, but protesters say the deal does not tackle Rwanda's alleged backing of the group.
"There was nobody in the summit (from M23), so it doesn't really concern us," M23 rebel spokesperson says of truce deal signed by the African neighbours in Angola.
M23 rebel group must withdraw from its occupied territories in the eastern Democratic Republic of Congo or face intervention by regional forces, leaders of five African countries warn.
Fresh talks are taking place in the backdrop of heavy fighting between M23 rebels and government forces, which have led to unprecedented civilian displacement in the region.
Congolese officials say the identity of the dead man who crossed the border was not known, but that no Congolese soldier on duty in the area had been reported missing.
Rwanda's President Paul Kagame agrees to assist Kenya's ex-leader Uhuru Kenyatta in urging M23 rebels to drop weapons and withdraw from eastern Democratic Republic of Congo.
Warplanes of Democratic Republic of Congo hit rebel positions in Kibumbaby town of eastern North Kivu province, as rebels push closer toward main Goma city, locals and officials say.
Military of Democratic Republic of Congo uses newly deployed jets to bombard M23 positions in the east of the African country, as some residents flee across the border, officials say.
The Democratic Republic of Congo accuses neighbouring Rwanda of supporting M23 militia, while Kigali denies backing the rebels.
Luanda is hosting foreign ministers of both African neighbours in bid to de-escalate tensions sparked by rise of M23 rebels menacing eastern DRC.
Kenya will command the joint regional force, which will also include soldiers from Burundi, Uganda and South Sudan.
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