Bill de Blasio has been sworn in as the 109th mayor of New York City.
He is the first Democrat to occupy City Hall in more than two decades and vows to pursue a sweeping liberal agenda for the nation's largest city.
He took the oath of office in a small ceremony in his Brooklyn home Wednesday, minutes after midnight.
The 52-year-old de Blasio was joined by his wife and their two teenage children. The oath was delivered by state Attorney General Eric Schneiderman.
A grander celebration is planned for City Hall at noon. Former President Bill Clinton will deliver the oath.
The new mayor was elected on the promise of being a sharp break from Michael Bloomberg, who leaves office after 12 years.
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