GOMA, Congo, Feb 2, (AP): At least 773 people were killed in eastern Congo's largest city of Goma and its vicinity this week amid fighting with Rwanda-backed rebels who captured the city in a major escalation of a decadelong conflict, Congolese authorities said Saturday. The rebels' advance into other areas was slowed by a weakened military that recovered some villages from them.

Authorities confirmed 773 bodies and 2,880 injured persons in Goma's morgues and hospitals, Congolese government spokesman Patrick Muyaya told a briefing in the capital, Kinshasa, adding that the death toll could be higher. "These figures remain provisional because the rebels asked the population to clean the streets of Goma.

There should be mass graves and the Rwandans took care to evacuate theirs,” said Muyaya. Hundreds of Goma residents were returning to the city on Saturday after the rebels promised to restore basic services including water and power supply. They cleaned up the neighborhoods littered with debris from weapons and filled with the stench of blood.

"I’m tired and don’t know which way to go. On every corner (there) is a mourner,” said Jean Marcus, 25, one of whose relatives was among those killed in the fighting. M23 is the most potent of more than 100 armed groups vying for control in Congo’s mineral-rich east, which holds vast deposits critical to much of the world’s technology. They are backed by around 4,000 troops from neighboring Rwanda, according to UN experts, far more than in 2012, when they first captured Goma and held it for days in a conflict driven by ethnic grievances.

As the fighting raged on with the M23 rebels Saturday, the Congolese army recaptured the villages of Sanzi, Muganzo and Mukwidja in South Kivu's Kalehe territory, which had fallen to the rebels earlier this week, according to two civil society officials. who spoke to The Associated Press on the condition of anonymity over fear for their safety.

The central African nation’s military has been weakened after it lost hundreds of troops and foreign mercenaries surrendered to the rebels after the fall of Goma. UN peacekeeping chief Jean-Pierre Lacroix, meanwhile, said Friday that the M23 and Rwandan forces were about 60 kilometers (37 miles) north of South Kivu’s provincial capital of Bukavu, covering almost the same distance in the previous two days since they started advancing along Lake Kivu on the border with Rwanda. Lacroix said the rebels "seem to be moving quite fast,” and capturing an airport a few kilometers (miles) away "would be another really significant step.”