Amadou Sangho, spokesman for the Interior Security Ministry, said the dead include four civilians, two gendarmes and a customs official.
The attack took place Sunday night when gunmen on motorcycles opened fire, killing seven people. A similar attack happened in Boura, about 55 kilometers (34 miles) away but no one was killed.
There was no immediate claim of responsibility though Islamic extremists are known to be active along the porous border with Burkina Faso.
Sunday's violence marked the first time that government buildings in the Sikasso region of southern Mail had been attacked in the last four years.
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