US Secretary of State John Kerry left Thursday for a key eco**mic conference in Egypt, followed by further talks in Switzerland on Iran's suspect nuclear program. Kerry is due to arrive Friday in the Egyptian Red Sea resort of Sharm al-Sheikh to attend an international eco**mic conference, set to burnish President Abdel Fattah al-Sisi's global credentials. Egypt hopes the foreign investor conference will jump-start its battered eco**my while showcasing international support for Sisi as he battles radical Islamist opponents.