"Our base in Gargando was attacked early Saturday by Islamist terrorists," Oumar Ag Keling, a member of the Tuareg-led Congress for Justice in Azawad, told AFP.
Gargando is a small town in central Mali located about 170 kilometres (106 miles) to the west of historic Timbuktu.
"They killed four of our fighters, as well as the village chief," Keling said, adding that the jihadist rebels were "of many nationalities, according to the documents found at the scene".
For more than a month, the CJA -- formed in October 2016 to gain a bigger voice in the peace process for the Tuareg ethnic community of Kel Ansar, in Mali's northwest -- has opposed the installation of interim local authorities in Timbuktu, a central part of a peace deal signed in 2015.
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The rebels signed the deal along with the government and pro-Bamako militias in the hopes of bringing stability to the north, the cradle of several Tuareg uprisings and a sanctuary for Islamist fighters.
The implementation of the peace accord however has been piecemeal and insurgents who refused to sign the deal are still active across large parts of the country.
Mali's north fell under the control of jihadist groups linked to Al-Qaeda in 2012 who hijacked the rebel uprising, though the Islamists were largely ousted by a French-led military operation in January 2013.
In another attack, a member of a pro-government group was killed on Friday in the northeast village of Anefis, according to an international security source, but they could not identify the perpetrators.
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