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Published 18:32 19 Apr 2014 BST
Updated 18:20 20 Apr 2014 BST
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The comfort dogs have helped to bring solace to people
Last year several golden retrievers were dispatched to the city shortly after the bombings, and were placed at the church and local hospitals.
"Dogs just bring a wonderful comfort," Tim Hetzner, president of LCC K-9 Comfort Dogs, told Yahoo News. "They're a calming presence and allow victims to open up and talk about what happened -- which is a critical part of the healing process."
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