Gunmen killed about 15 people and wounded others in an attack on a mosque in northern Burkina Faso during prayers on Friday evening, a security source and a local official told Reuters.
The identity of the gunmen was not yet clear. This year an Islamist insurgency in Burkina Faso has ignited ethnic and religious tensions, especially in the northern areas bordering restive Mali.
Two of the wounded are in critical condition, sources said.
A resident from the nearby town of Gorom-Gorom confirmed the attack, saying Salmossi residents had fled their homes afterwards.
Until 2015, landlocked Burkina Faso was largely spared violence that hit Mali and then Niger, its neighbours to the north.
But jihadists — some linked to Al-Qaeda, others to the so-called Islamic State group — started infiltrating the north, then the east, and then endangered its southern and western borders.