The Federal Aviation Administration has received numerous reports of falling debris across Texas, which could be related to a recent satellite collision. Some of the callers around midmorning Sunday reported what looked like a fireball in the sky. FAA spokesman Roland Herwig said officials suspect the debris could be related to the collision, but that has not been confirmed. The FAA notified pilots Saturday to be aware of possible debris after a collision Tuesday between US and Russian communication satellites. The chief of Russia's Mission Control said clouds of debris from the collision would circle Earth and threaten numerous satellites. A spokesman for the County Sheriff's Office said the department used its helicopter to search for the source of the debris but found nothing.