The US government issued its latest version of a worldwide safety caution Wednesday to US citizens abroad. Terrorist groups "continue to plan terrorist attacks against US interests in multiple regions, including Europe, Asia, Africa, and the Middle East," the (CNN) reported citing a statement by the Department of State's Bureau of Consular Affairs. Travelers should be cautious when using public transportation systems, including maritime services like ferries, the statement said. The Middle East and Africa are the most unpredictable areas, with terrorist groups and pirates attacking recently in Yemen, Algeria, Kenya and Somalia, the statement said. It listed a number of places that might be targeted, including "high-profile sporting events, residential areas, business offices, hotels, clubs, restaurants, places of worship, schools, public areas, and other tourist destinations."