This was wideley reported last week. A number of witnesses reported that they observed the tail rotor (or tail rotors) detach before then seeing the aircraft spin violently, and then crash into the sea.
I visit Netanya every month and the main aircraft used in Israel (in a civilian capacity) are Robinson 22 and 44 with the odd Jet ranger. I think there maybe 1 or 2 MD500's in use too.
Choppers fly up and down the coastline every 5 minutes and Sde Dov, the airfield the aircraft departed from is just slightly inland. It is in fact a military airfield with a civilian section.
Not at all good news.
Joel