(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.

The Rwanda-backed rebels who captured key areas of Congo’s mineral-rich east say they have withdrawn from planned peace talks with the country’s government in Angola.

The resurgence of Rwanda-backed insurgents in eastern Congo has reignited a decades-old conflict over ethnic rivalries, mineral wealth, and political representation.

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.

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,