"In their pursuit of the terrorists, the FAMa (Malian armed forces) were victims of a mine explosion," the army said. "The incident took place... in the Bulkessy (Mopti) sector on the border with Burkina Faso."
"The casualty toll is three dead and three wounded," added the statement, without giving any further details.
On December 21, the army in the large northwest African nation, mostly desert, announced the killing of five armed Islamic extremists and the death of a soldier when troops fought off an attack near Niono in the centre.
The extremists were largely driven out in a French-led military operation launched in January 2013, but large tracts of the country are still not controlled by Malian or French forces, nor a UN peacekeeping mission.
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These forces regularly come under attack despite the signature in mid-2015 of a peace pact intended to isolate armed extremists.
Since then, the attacks have spread southwards in Mali and violence has also struck in neighbouring Burkina Faso and Niger.