I would be very careful believing what the original poster of that vid clip says about it. If you go to his site or read the comments at the original YouTube posting it would appear that he is someone with an anti American agenda. Here is one of the comments:

"This was not a cluster bomb, nor was it in Brega. (If that was a cluster bomb then Misrata would be wiped off the map because Gaddafi forces have been shelling non-stop with those for a while now.) Anyways, this video is of an ammunition dump in the Benina Airport area in Benghazi exploding, this was reported a while back. It was a result of sabotage or an accident as there was no fighting anywhere near there nor in Benghazi at the time.

I am Libyan, also from Benghazi. Search Benghazi Explosion
BarcaFeb17 3 weeks ago 3