Fighting erupted yesterday near the restive northeastern town of Kidal between ex-rebels from the Coordination of Azawad Movements (CMA) and members of the pro-government group GATIA.
Calm returned overnight, but "resumed this morning," said an official with the Imghad and Allies Tuareg Self-Defence Group (GATIA).
The two sides had clashed with heavy arms in Kidal itself on July 21-22, and again on July 30 around 40 kilometres to the east of the town, several sources said.
The clashes were confirmed to AFP by a source in MINUSMA, the United Nations peacekeeping mission in the west African country, which helps maintain calm in Kidal.
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"We have information on fighting" underway near Kidal, said the source, giving no further details.
Meanwhile Mali's army said it had recovered the bodies of five soldiers missing since an attack Monday in the Mopti region in the centre of the country.
Four bodies were found Tuesday and a fifth today morning, said an army spokesman. "At this stage we cannot specify the cause of death. Our experts are still examining the remains," he said.
One military source blamed the attack on the soldiers on the Malian jihadist group Ansar Dine, which claimed a previous deadly attack against the army in the Mopti region on July 19, in which 17 soldiers died.
Ongoing international military intervention since January 2013 has driven Islamist fighters away from major population centres, but large tracts of the sub-Saharan country are still not controlled by Malian and foreign troops.