U.S. Issues 'Worldwide Caution' Alert to Travelers Amid Iran War

State Department warns of potential targeting of U.S. interests overseas by Iran-supportive groups

Mar. 23, 2026 at 2:50am by Ben Kaplan

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The U.S. Department of State has issued a 'worldwide caution' security alert, instructing Americans traveling abroad to 'exercise increased caution,' especially in the Middle East, amid the ongoing war in Iran. The alert warns that U.S. diplomatic facilities and other locations associated with the U.S. may become targets for groups supportive of Iran, even outside the Middle East region.

Why it matters

The U.S. alert comes as the conflict between the U.S., Israel, and Iran has escalated, with over 2,000 casualties reported so far. The crisis has centered on the Strait of Hormuz, a crucial global oil chokepoint that Iran has effectively closed. This alert highlights the widening impact of the conflict and the potential for U.S. citizens and interests to be targeted overseas.

The details

The State Department is urging Americans abroad to enroll in the Smart Traveler Enrollment Program (STEP) to allow for quick contact in emergencies. The department also has a WhatsApp channel for security alerts. Travelers should also be aware of country-specific travel advisories, which are updated regularly. The U.S. has issued similar alerts previously, including at the start of the conflict in February and in June 2025 amid tensions between Israel and Iran.

  • The State Department issued the 'worldwide caution' alert on Sunday, March 23, 2026.
  • The U.S. and Israel launched airstrikes in Iran in late February, triggering the ongoing conflict.

The players

U.S. Department of State

The federal agency responsible for U.S. foreign policy and diplomacy, which issued the 'worldwide caution' alert to American travelers.

Iran

The country that is engaged in an ongoing conflict with the U.S. and Israel, which has led to the State Department's travel alert.

Israel

The U.S. ally that has joined the U.S. in launching airstrikes against Iran, contributing to the escalating conflict.

President Donald Trump

The U.S. president who has demanded the reopening of the Strait of Hormuz, a crucial global oil chokepoint that Iran has effectively closed.

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What’s next

The U.S. government is deploying Immigration and Customs Enforcement (ICE) agents to airports starting Monday, as Transportation Security Administration (TSA) workers remain unpaid due to the ongoing federal government shutdown. This move has faced backlash from labor leaders and Democrats, who argue that ICE agents are not trained or certified in aviation security.

The takeaway

This State Department alert underscores the widening impact of the conflict between the U.S., Israel, and Iran, and the potential for U.S. citizens and interests to be targeted overseas. It highlights the importance for American travelers to stay informed, enroll in security programs, and be aware of evolving travel advisories as the situation remains fluid and potentially dangerous.