Reminds me of a time I was picked up in Al Amarah and dropped off in SLB. As we came down to land, the chaff, or flares, whatever they are, all got fired about 5 metres up from the tarmac. I heard the Pilot speaking, casually as you like, over the IC to the navigator...
"Do you think we should report that?"
Having read a few of the comments from the clip, it appears they are fireworks (they dont look like flares and they are not coming from flare dispensers) and the aircraft was possibly transporting them. Somehow they went off and gravity overcame the basic principals of flight.