More red-winged blackbirds have fallen from the sky, this time in Louisiana. 

In a television report, a reporter stated that the birds in Arkansas were startled by fireworks and flew wildly in the dark and crashed into buildings and other objects. They died of internal injuries. The explanation for the same type of birds involved in both Arkansas and Louisiana is that blackbirds are very common this time of the year. They typically form large flocks. See here.