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The police chief in the Mexican border city of Tijuana has been removed from his post following a weekend in which 37 people were killed.

State authorities say Jesus Capella, who had received numerous threats, will be replaced by an army officer.

Mexico's border with the US is facing spiralling drug violence, and several police chiefs have either been murdered or arrested on corruption charges.

Three months of violence in Tijuana have claimed more than 300 lives.

Even by the current violent standards of the city, last weekend was particularly gruesome.

Of the 37 people killed, nine men - including three police officers - were found decapitated.

Four children also died, apparently caught in the crossfire.