It happened on Long Island, not NYC. NY state still has very stringent gun control though - enough to have deterred any of the victims from being able to defend themselves.* A vision of the world that Democrats many Republicans and all liberals want - a world where only the police and military can legally be armed. I believe this district is adjacent to Carolyn McCarthy's (arguably the most rabid anti-gun fanatic in Kongress) district.
*The major premise that gun control advocates want you to believe is that the more helpless you are the safer you are. Doesn't make sense to me, but I'm not a liberal.