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Summer Street in downtown Boston is empty as authorities hunt for the Boston Marathon bombing suspect on April 19, 2013. Much of the Boston area was closed or on lockdown during the investigation, and residents were asked to stay inside. John Tlumacki/The Boston Globe via Getty Images
A man crosses a vacant Beacon Street, across from Boston Common. John Tlumacki/The Boston Globe via Getty Images
Federal Street, in the Financial District Jim Davis/The Boston Globe via Getty Images
The Boston Red Sox postponed a baseball game because of the manhunt. Jim Davis/The Boston Globe via Getty Images
Moody Street was deserted in nearby Waltham, Massachusetts. Suzanne Kreiter/The Boston Globe via Getty Images
Congress Street in Boston Jim Davis/The Boston Globe/Getty Images
Beacon Street, with a view toward the Massachusetts State House Jim Davis/The Boston Globe/Getty Images
The area near Boston's Downtown Crossing would usually be filled with lunchtime crowds. Jim Davis/The Boston Globe/Getty Images
The Boston Public Garden Jim Davis/The Boston Globe/Getty Images
Congress Street at Milk Street Jim Davis/The Boston Globe/Getty Images
The Boston Public Garden Jim Davis/The Boston Globe/Getty Images
The area around the North Station next to the TD Garden Jim Davis/The Boston Globe via Getty Images
The Harvard Bridge, known locally as the Massachusetts Avenue Bridge Jonathan Wiggs/The Boston Globe via Getty Images
A lone bicyclist makes his way across the Longfellow Bridge. Jonathan Wiggs/The Boston Globe via Getty Images
Watertown Square Bill Greene/The Boston Globe via Getty Images
Friend Street near North Station Jim Davis/The Boston Globe via Getty Images
A flower sits near the site where a police officer was killed in nearby Cambridge, Massachusetts. Jonathan Wiggs/The Boston Globe via Getty Images
Ceasar McDowell, an urban studies professor at the Massachusetts Institute of Technology, says he went for a walk only to find everything closed except for a CVS drugstore and a Dunkin' Donuts. "I don't know how to describe it," said McDowell, a CNN iReporter. "(I)t was eerie that quietness." courtesy Ceasar McDowell
Massachusetts Avenue in Cambridge Jonathan Wiggs/The Boston Globe via Getty Images
The area around North Station Jim Davis/The Boston Globe via Getty Images
The usually bustling Boston University campus Adam Aigner-Treworgy/CNN
