Police in the state's most populous city were called to the house just before 1:30 a.m. ET and arrived to find 11 men and two women with gunshot wounds, Captain Brian Fitzgerald said in an emailed statement.
One of the casualties remains in critical condition after being hit in the face, Reuters reported.
Police think at least two shooters fired through the hedges from the backyard into a "large house party," according to the statement. An investigation is ongoing and there was no immediate word on arrests or the possible motive.