代理美国外事的瑞士驻德黑兰大使馆已关闭，美国务院警告：滞留伊朗美国人应做好长期就地避难准备

Core Viewpoint - The U.S. State Department has issued a warning for American citizens in Iran to prepare for long-term sheltering in place, indicating that the U.S. government is not expected to provide direct assistance for departure [1] Group 1 - The U.S. government has no diplomatic presence in Iran, complicating the situation for American citizens seeking assistance [1] - Switzerland, which has been responsible for assisting U.S. citizens in Iran, has closed its embassy in Tehran, further limiting options for Americans [1] - American citizens are advised to utilize existing means to leave Iran, as direct government assistance is not anticipated [1]