The following is a link to an article in French on another FR thread talking about the whole families that perished together in the Egyptian crash. At the end of the article there was a different version of that nephew's cell phone message from his aunt on the flight.
http://www.freerepublic.com/focus/f-news/1052009/posts?page=17#17 Go down to post 22 where I have translated that paragraph to English. It's a little different from the account I read on this thread a day or so ago.
That certainly sounds like that plane had a hit(intervention?) or explosion.