Northern Mali has seen violence escalate since Tuareg-led rebels, allied with groups linked to Al-Qaeda, took control of the area in 2012
Seventeen soldiers were killed and 35 wounded in central Mali in an assault on their base that authorities called a "coordinated terrorist attack".
"The toll has increased: we have lost 17 men and 35 are wounded," Mali's defence minister Tieman Hubert Coulibaly said on Tuesday. Authorities had earlier announced that 12 soldiers were killed.
Coulibaly called the assault a "coordinated terrorist attack on our positions," but did not say who was responsible.
The gunmen's descent on the military camp in Nampala was earlier claimed by a group from the ethnic Peul community, calling themselves the National Alliance for the Protection of Peul Identity and Restoration of Justice (ANSIPRJ).
The group said it had killed eight troops and wounded 11 more, as well as making off with two trucks and five pick-up trucks.
"It was self-defence," Sidy Cisse, a senior ANSIPRJ commander, told AFP, adding three of his men were wounded.
Earlier Al-Akhbar, a Mauritanian news agency, reported that several soldiers had been taken hostage, and the base was set alight.
Senior figures within ANSIPRJ are also members of a Peul association that decried the murder of what it said were several Peuls falsely accused of supporting jihadists active in the area.
A Peul radical, Amadou Koufa, leads the Macina Liberation Front (FLM), a new group that emerged in 2015 and has claimed responsibility for a number of attacks, some targeting security forces in central Mali.
Several security sources in the region told AFP they doubted the veracity of the claim of responsibility from ANSIPRJ as the group was only founded last month following inter-communal clashes in the area and lacked the means to mount an attack.
Coulibaly said the government was aware "a group had issued a claim. We are being careful."
"One thing is sure, this was a terrorist action that targeted a military objective. So an appropriate military response is forthcoming," he added.
The Malian government said the attackers would be hunted down and punished, and that the military had control of Nampala.
Northern Mali has seen repeated violence since it fell under the control of Tuareg-led rebels who allied with jihadist groups linked to Al-Qaeda in 2012.
But attacks are now becoming more frequent in the country's centre, close to its borders with Burkina Faso and Niger, both from criminal and jihadist elements.
Although Islamists were largely ousted by an ongoing French-led military operation launched in January 2013, sporadic attacks from desert hideouts are common.