The YAV operator could easily see if a helicopter is in the area and move his craft well out of the area. This seems like a case of over reach of authority. As a former freelance photographer, I have run into a similar situation twice, once at a railroad derailment and once at a fatal car accident. Thankfully cooler heads prevailed and my access to the area was soon OK'd.
Chalet, you misunderstood the post. I was thinking of another crash (check my attachment) while reading about this one where somebody claimed they saw a breakup, explosion and a parachute.
Semper Fi
There was no mid air explosion. The plane did not breakup into three pieces. There was no parachute visible. Somebody was drinking too much goat milk!
http://www.youtube.com/watch?v=7sUWC2jfjqI&feature=youtube_gdata_player