(Reuters) -Rwandan-backed M23 rebels asserted their control over east Congo's largest city Goma on Thursday by calling on residents to resume normal life, even as the group clashed with Congolese troops as they tried to take more territory.

Rwanda-backed rebels who have captured eastern Congo’s largest city say they plan to take their rebellion to the capital and seek to gain political power

Kagame's comments clearly suggested that he wants South Africa to back off from DR Congo, where its military involvement dates back to the late 1990s. It first joined the UN's peacekeeping mission, Monusco, following the end of the racist system of apartheid in 1994.

President Paul Kagame said Rwanda was ready for "confrontation" as he rejected criticism over his backing for M23 rebels who were pushing south on Thursday in eastern Democratic Republic of Congo after capturing the major city of Goma.

Four more South African soldiers have been killed in fighting with M23 rebels in the Democratic Republic of Congo, the government said, taking the number of South African peacekeepers killed to 13 since the conflict escalated last week.

M23 rebels fighting the Congolese army in eastern Congo are using advanced weapons and equipment similar to those used by the Israeli army and US special forces, a retired South African army general said Tuesday.