The U.S. government issued a worldwide safety caution recently for American travelers abroad, warning of the growing risk of attacks in multiple regions.
The State Department said travel warnings are issued when "long-term, protracted conditions" make a country "dangerous or unstable."
"Terror groups continue to plan attacks against U.S. interests in multiple regions, including Europe, Asia, Africa and the Middle East," the latest advisory said, with a list of countries to avoid if possible.
Officials also urged travelers to "be cautious when using public transportation systems, including maritime services like ferries."
The advisory lists a number of potential targets, including high-profile sporting events, hotels, places of worship, and other tourist destinations.
India, the Central African Republic, Kenya, Nigeria and Afghanistan are among the latest travel warnings.