By Jackie Bruno, Kathryn Sotnik and Allison Freedman ••
As the calendar turns to 2016, the city of Boston was packed with revelers enjoying the First Night celebrations.
As the calendar turns to 2016, the city of Boston was packed with revelers enjoying the First Night celebrations.
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The ice sculpting has begun in Boston.
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One ice sculpture portrays the "Codzilla" watercraft.
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A close-up of the "Codzilla" ice sculpture.
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One of the many ice sculptures that will be on display as part of First Night Boston.
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Preparations are underway for First Night Boston.
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A First Night photo opportunity for children and adults alike.
One of the First Night Boston ice sculptures.
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First Night preparations are underway in Boston.
Boston Police
Ice sculpting in Boston.
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Another First Night Boston ice sculpture.
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One of the First Night Boston ice sculptures.
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First Night Boston revelers prepare to ring in the new year.
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Necn's Monica Madeja is ready for the new year!
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Boston is ready to ring in the new year at First Night!
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Boston is ready to ring in the new year at First Night!
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Boston is ready to ring in the new year at First Night!
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Boston is ready to ring in the new year at First Night!
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Boston Mayor Marty Walsh leads the city's New Year's Eve parade.
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Boston Police Commissioner William Evans takes part in the New Year's Eve parade.
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Revelers take part in Boston's New Year's Eve parade.
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Boston Red Sox mascot Wally the Green Monster marches in the New Year's Eve parade.
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Pat, the mascot of the New England Patriots, takes part in Boston's New Year's Eve parade.
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Fireworks go off during First Night in Boston.
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Fireworks go off during First Night in Boston.
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Fireworks go off during First Night in Boston.
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Fireworks go off during First Night in Boston.
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The Prudential Tower is lit up to ring in the new year in Boston!
The number of people out on the streets, however, meant heightened security - including police, in uniform and undercover, explosive sniffing dogs, tactical teams and other measures.
"It's a delicate balance," Boston Police Commissioner William Evans said. "I don't want people to see it and be intimidated. We have plenty of resources, a lot of undercovers working the crowds, and things are good."
Police say a 911 call to NYPD Monday referencing an anonymous threat to Boston was unsubstantiated.
Boston prepares for its big First Night celebration
Mayor Marty Walsh says he was pleased to see all the crowds and families who came out.
