Kingsport's Scott Horton, 50, has been running competitively for more than 20 years, and says it was a "dream come true" to cross the finish line at the Boston Marathon.
But approximately four hours later, sitting in his locked down motel a block from Monday's fatal explosion, he conceded the day had turned into a nightmare. He said ATF agents were swarming the building while he and his wife, like the rest of the nation, attempted to glean what information they could from media reports.
"At first we didn't know what it was, but it sounded like a bomb could have went off," Horton said of the explosions, which as of late Monday had killed two and injured more than 80. "When we saw the people running we knew something had happened. People were crying, all the sirens started. Total chaos."