Shi'ite Muslim Houthi rebels pressed their offensive on Saturday against a town in north Yemen held by their Sunni Muslim Salafi rivals, a Salafi spokesman said, bringing the total death toll in four days of sectarian clashes to 55. Spokesman Serour al-Wadei denied a statement on the Yemeni defense ministry website saying that the fighting in the town of Damaj had ended on Friday afternoon and that the Yemeni army had taken up positions in the troubled area.