Gunmen have burned down a church during mass and killed six people, including a priest, in Burkina Faso, reports say.

The morning attack happened in the northern town of Dablo, security sources and local official said.

"Towards 9.00 [local time 10:00 GMT), during mass, armed individuals burst into the Catholic church...They started firing as the congregation tried to flee," the mayor of Dablo, Ousmane Zongo, told news agency AFP.

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