Sixteen people have now been charged over claims of being involved in a plot to overthrow the President of the Philippines, Gloria Arroyo. A state of emergency has been extended into a fourth day, only hours after dozens of elite marines briefly defied the order in support of their sacked commander. Police say charges have been laid against four leftist members of Congress, as well as active and former soldiers. Arroyo has appeared on national television, reviving an old promise to improve pay and conditions for soldiers.Anti-Arroyo demonstrators accuse the president of using curfews and putting pressure on the media to try to stay in power. Arroyo survived an impeachment attempt last year over allegations of vote rigging and graft. One of those wanted by police is a former army colonel and senator who has beenlinked to about a dozen coup attempts in the Philippines over the past 20 years.