Here's the video that proves the Israelis opened fire first, in a YouTube viewer (which makes it easier to find than the one that was embedded in the large page that I provided before). In it we can see the correspondent saying that there are wounded people on the ship before any of the Israeli terrorists had even left the helicopter...

http://www.youtube.com/watch?v=gAuz6HoqV4g

And here's some more information about the killed people (that we know about, there are several people who are still missing). They left behind 28 fatherless children...

http://www.presstv.ir/detail.aspx?id=129187§ionid=351020202