At least four people have died and two are missing after an explosion at a mine in northern Spain, officials say.

Some three others were injured in the explosion at the Cerredo mine in Degaña, Asturias on Monday morning, according to local emergency services.

A search is under way for the missing workers and fire and rescue services have been sent to the scene.

Spain’s Prime Minister Pedro Sanchez sent his condolences to the families of the victims.