Six people were killed in an attack on G5 Sahel joint force headquarters in Sévaré, central Mali, which also injured many people, hospital and military sources said.

“I see only six bodies, the others are injured,” said a hospital source, without further details. A military source confirmed a provisional death toll of six, suggesting the possibility of casualties.

The G5 is a taskforce of soldiers from Mali, Niger, Burkina Faso, Chad and Mauritania created last year to root out violence in West Africa’s semi-arid Sahel region.

Violence by militants has proliferated in the sparsely-populated Sahel in recent years, with groups linked to al Qaeda and Daesh using central and northern Mali as a launchpad for attacks across the region.