I suppose the fireworks idea could have some merit.
There are several things of interest in different reports though.
Some say the birds were spooked from their roost by the pro type fireworks that were set off near by, ones much more powerful than the standard bottle rocket.
That caused them to take flight and other fireworks in the area kept them flying in the air and being having poor night vision (do they?) they crashed into dwellings and the like.
They were reported to have damage to their breast caused by this, other reports stated massive internal damage to their internal organs.
What bothers me about this is that none of the reports mention damage to their heads or necks. They should have this I should think, possibly some snapped neck bones. If they crashed into something they would hit their heads and necks before their breasts.
Also I don't think "massive internal damage to their internal organs" would result from flying into something, especially if no damage was noted on their beaks, heads, or necks.
Were any found in vast, open areas? If so, dwellings could not have been a factor.
I once saw a bird fly into a window. It fell to the ground dead. I assumed it snapped its neck.
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