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Boston Mayor Martin Walsh wasn't in office at the time of the marathon bombings last year, but on Monday he perfectly summed up the sentiment likely shared by his community.

"I think it’s going to be a difficult day for a lot of people tomorrow," Walsh told NBC News.

On Tuesday the city will mark a year since the April 15, 2013, bombings, and NBC News' Erin McClam and Jim Seida are there to catalog the city's resilience.

Another melancholy milestone will come next, week when the marathon itself will be run on April 21 — Patriots Day in Boston.