BOSTON (CBS) – Rich Shertenlieb, a radio host on 98.5 The Sports Hub, lives in one of the buildings that was damaged by an explosion near the finish line of the Boston Marathon.

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Two simultaneous explosions went off shortly before 3pm Monday on Boylston Street Monday.

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“I was putting my son down for his nap and we heard this loud explosion,” Shertenlieb told WBZ-TV. “I saw the smoke rising up to my window, by the time I looked out, another big bomb had sounded like it went off, it shook our building.”

Rich and his wife, who is undergoing cancer treatment, rushed downstairs to see what was going on. “When we got down to the lobby apparently the bomb or whatever had gone off had blown through the door and had blown people into our lobby,” said Shertenlieb. “There were people lying around covered in blood.”

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Rich said he had taken his son to watch the runners about 45 minutes prior to the explosions. He says the crowd was about six people deep at the time.