U.S. says Americans traveling to Iran risk arrest

U.S. citizens traveling to Iran, particularly Iranian-Americans, risk arrest and detention in the Islamic republic, the U.S. State Department said in a travel warning on Friday. The notice, which largely echoes an August warning, was issued days after five Americans, including four dual Iranian nationals, were released by Iran in a prisoner swap coinciding with the lifting of economic sanctions on Iran as the implementation of a deal to curb its nuclear program began. The warning aims to "reiter