WASHINGTON (AP) Americans who are traveling overseas are being urged to take extra precautions.
The United States is issuing a global travel alert, citing an al-Qaida threat that also caused the State Department to close 21 embassies and consulates this weekend in the Muslim world.
Today's alert cites dangers involved with public transportation systems and other prime sites for tourists -- noting that previous terrorist attacks have centered on subway and rail networks, as well as airplanes and boats.
Officials are urging Americans to register with consular authorities in the countries they're visiting, through a travel registration website.
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