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Explosions rock Boston Marathon; several injured

(CNN) — Two large explosions rocked an area near the finish line of the Boston Marathon on Monday, injuring at least six people and spewing wreckage in its wake. Smoke billowed into the air at Copley Square, turning a site of celebration into a mess of destruction. Crowds had gathered in the area to watch the runners. At least four people were being treated at Massachusetts General Hospital.... »