Prosecutors in the Philippines have now charged a provincial governor in connection with last month's massacre on the southern island of Mindanao. <br /><br />The killings in Maguindanao province left 57 people dead, following an ambush on a convoy of political campaigners and accompanying journalists.<br /><br />The convoy had been on its way to file campaign papers for a candidate challenging the incumbent governor in elections next year.<br /><br />Al Jazeera has gained exclusive access to a witness saying the powerful clan leader masterminded the massacre.<br /><br />Marga Ortigas reports from Manila.
