ZAATARI, Jordan — Angry Syrian refugees confronted U.S. Secretary of State John Kerry on Thursday with demands for the United States and the international community to do more to help opponents of President Bashar Assad's regime, venting frustration at perceived inaction on their behalf. Visiting the sprawling Zaatari refugee camp in northern Jordan near the Syrian border, Kerry met six representatives of its 115,000-strong population, all of whom appealed to him for the U.S. and its allies to create no-fly zones and set up safe zones inside Syria to prevent the Assad regime from inflicting additional destruction. The United Nations says the conflict has killed more than 93,000 people and become the world's worst humanitarian crisis since the 1994 Rwandan genocide.