(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,

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

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.

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.

After talks in Qatar, the two countries’ presidents said they were committed to an unconditional truce between Congo’s army and a rebel group that Rwanda denies backing.