| http://www.w3.org/ns/prov#value | - 100.As cities across the United States went on high alert President Barack Obama said it was not yet clear who was behind the explosions.While he did not say the blasts were a terror attack, a White House official said any event with multiple explosive devices -- as this appears to be -- is clearly an act of terror.On Wall Street the Dow and S&P 500, which last week hit record highs, both slid.
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