Reuters reports that the attack was the worst in months in the West African country that for years has been overrun by hardline militants.
Burkina Faso has been battling armed groups, some with links to al Qaeda and Islamic State, in its desert north since 2015.
Attacks have worsened this year, making the country the epicentre of a violent movement that has also engulfed poverty-stricken Mali and Niger, killing thousands and forcing millions out of their homes.
Burkina Faso saw two military coups last year, triggered by anger at failures to stem a jihadist insurgency that has claimed thousands of lives.
Since 2015, more than 16,000 civilians, troops and police have died in jihadist attacks in Burkina Faso, according to a count by an NGO monitor called the Armed Conflict Location & Event Data Project (ACLED).
More than 5,000 have died since the start of this year.
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