Sadly, New York Mayor Eric Adams has confirmed the death of three adults and three children (a visiting family of tourists from Spain and the pilot). Four were pronounced dead at the scene, and two others were taken to area hospitals where they succumbed to their injuries.
It appears that a rotor blade had come loose, with the instability causing the two-blade rotor to completely detach from the aircraft together with its transmission and slice though the tail. The main part of the chopper landed upside down in the water, with the rotor assembly following it down.
It may or may not be significant that the NBC4 channel reported that its own helicopter, hoping to get news footage from the air, was unable to take off because of conditions, with the weather in New York described as windy, under thick cloud cover.