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Four people have been killed when a police station and local government office were destroyed by gunmen in north-eastern Nigeria, police say.

The attacks came in the town of Song, near the border with Cameroon.

A policeman, a soldier, a civilian and his grandchild were killed, the Adamawa state police spokesman told the BBC.

He did not blame any group but militants from the Boko Haram Islamist group have staged frequent attacks in northern Nigeria.

They have often targeted Adamawa state but this is believed to be the first time Song has been attacked.