A travel alert issued Sunday by the State Department advises travelers to take extra precautions when traveling in Europe. The alert cited heightened concerns about a potential al-Qaida attack. Officials said they based the alert on general intelligence gathered over the past several weeks and specifically warned travelers about terrorist attacks on public transportation systems. "There's reason to be concerned, but as the general nature of the alert suggests, the precise timing and target of potential terrorist operations aren't known," a U.S. official said.
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