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WASHINGTON - The Obama administration on Sunday warned Americans of potential terrorist threats in Europe and urged them to be vigilant in public places, including tourist spots and transportation hubs.
"Current information suggests that al-Qaida and affiliated organizations continue to plan terrorist attacks," it said. "European governments have taken action to guard against a terrorist attack and some have spoken publicly about the heightened threat conditions."
It noted in particular "the potential for terrorists to attack public transportation systems and other tourist infrastructure."
"US citizens should take every precaution to be aware of their surroundings and to adopt appropriate safety measures to protect themselves when traveling," the department said.
US and European security experts have been concerned for days that terrorists may be plotting attacks in Europe with assault weapons on public places, similar to the deadly 2008 shooting spree in Mumbai, India.