(Reuters) -Rwanda-backed M23 rebels pressed deeper into Congolese territory a day after Congo and Rwanda's presidents called for an immediate ceasefire, entering the outskirts of the town of Walikale late on Wednesday,

Rwanda has denied supporting M23. It says its military has been acting in self defence against Congo’s army and a militia founded by some of the perpetrators of the 1994 Rwandan genocide.

Congo’s government says it will participate in peace talks in Angola with the Rwanda-backed M23 rebel group that has captured key areas of Congo’s mineral-rich east

The presidents of Congo and Rwanda have met in Qatar for their first direct talks since Rwandan-backed M23 rebels seized two major cities in mineral-rich eastern Congo earlier this year.

In a surprise announcement from Qatar Tuesday the Democratic Republic of Congo and Rwanda jointly called for a cease-fire in an effort to end warfare between them after 30 years of fighting.

It is the first time two leaders have met since Rwanda-backed M23 rebels stepped up an offensive in the region, where authorities say 7,000 people have been killed since January. It is unclear whether the M23 would heed the ceasefire call,