Police scanner traffic in Texas was abuzz Sunday morning with reports of fireballs or burning debris in the sky. Residents in Hill and Navarro counties also reported hearing an explosion or feeling their house shake.

The Federal Aviation Administration's spokesman Roland Herwig attributed the reports to falling debris from a recent satellite collision.

According to the Associated Press, a derelict Russian spacecraft designed for military communications and a working satellite owned by U.S.-based Iridium, which served commercial customers as well as the U.S. Department of Defense, collided over Siberia on Tuesday.

Herwig said airmen were warned that crash debris might fall this weekend. He said he started receiving calls at about 11 a.m. Sunday from law enforcement agencies across the state. The agencies were fielding questions from people who had either witness or found fallen debris.

"We don't know what has fallen yet. We'll find out in a day or so what we are looking at," he said.

He encouraged residents to call police and use caution around any debris that they may find on their property.

Earlier this week the chief of Russia's Mission Control said clouds of debris from the collision will circle Earth for thousands of years and threaten numerous satellites, the Associated Press reported.