MANILA (Reuters) – Philippines might send the navy’s most modern frigate to waters off Libya in a bid to “save” three Filipinos and a South Korean kidnapped last month from a water plant in the north African country. South Korea has redirected a vessel taking part in anti-piracy operations in the Gulf of Aden to help in the release of the four men taken almost a month ago. Philippine President Rodrigo Duterte said he might do the same. The men were taken near Ishwirif by an unknown armed group. Video footage appeared on social media this week of the four men confirming their names and nationalities and appealing to their presidents for help.