The State Department has issued a rare warning to all Americans traveling or living abroad, saying they could be targeted due to “heightened tensions” over the war with Iran. The warning, issued Saturday, urges Americans overseas to exercise increased caution and follow local security guidance, adding that U.S. diplomatic posts have been targeted both within and outside the Mideast. “Due to heightened tensions in the Middle East, the security environment remains complex with the potential for unforeseen escalation,” the State Department said. “Groups supportive of Iran may target other U.S. interests overseas or locations associated with the United States and/or...