BAGHDAD, Jan 23 (Reuters) - The U.S. military said on Tuesday reports that a helicopter had gone down in central Baghdad appeared to refer to a civilian aircraft. "No coalition forces aircraft are reported as down. Coalition forces are investigating what appears to be a crashed civilian aircraft," a U.S. statement said, responding to a query on reports of a crashed helicopter. Private security firms have helicopters operating in Iraq. Residents in central Baghdad told Reuters earlier they saw a helicopter come down and some said it had been shot first. One resident said he saw four bodies in the wreckage.
