The Arkansas Game and Fish Commission said it began receiving reports about the dead birds at about 11.30pm on Friday.
The birds fell over a one-mile area, and an aerial survey indicated that no other dead birds were found outside that area. Ornithologist Karen Rowe said the the birds showed physical trauma, and she speculated that "the flock could have been hit by lightning or high-altitude hail". The dead birds have been sent for testing. The commission said that New Year's Eve fireworks celebrations could have startled the birds from their roost and caused them to die from stress. The dead birds have been sent for testing."
Link to Original Source