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Investigators in protective suits examine material on Boylston Street in Boston on April 18, three days after the deadly bombings. The explosive devices were relatively simple to make and law enforcement officials come across them on a regular basis, officials say.

Above: Investigators in protective suits examine material on Boylston Street in Boston on April 18, three days after the deadly bombings. The explosive devices were relatively simple to make and law enforcement officials come across them on a regular basis, officials say.