Investigators comb downtown Nashville TN for clues in Christmas Day explosion

(STL.News) Investigators are creating a wide perimeter around downtown Nashville, Tennessee as they gather forensic evidence for clues about a Christmas morning explosion that damaged dozens of buildings and injured three people.  Experts say they will rely on aerial photography, surveillance footage and even GPS data in an investigation that could take months to complete.

Jeff Pegues reports.

YouTube video provided courtesy of CBS This Morning

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