New York City Mayor Bill de Blasio tweeted early on Sunday morning (Sunday night NZT) that the shooting in the east Brooklyn neighbourhood of Brownsville "shattered a peaceful neighbourhood event".
Twelve people were hit - seven men and five women between the ages of 21 and 55. A 38-year-old man died from a bullet wound to the head. His name was not immediately released. One of the injured was critical.
Six of the wounded had been released from the hospital by midday Sunday, NYPD Commissioner James O'Neill said.