A Transportation Security Administration officer was fatally shot by her husband Sunday before he killed himself on an off-site parking lot at Cleveland Hopkins International Airport, authorities said.

Before turning the gun on himself, the husband fired at a second TSA employee but missed, police spokesman Sgt. Sammy Morris said. The late morning shooting at an airport employee parking lot was an apparent homicide and suicide, Morris said.

No names were immediately released.

Morris said the husband and wife were estranged, but investigators weren't sure of a motive for the shooting.

The wife and the second TSA employee were commuting to work; the husband apparently followed his wife to the lot, blocked her in her car by his vehicle, and then began firing, Morris said. The other TSA worker wasn't hurt, police said.

Morris said the wife and the other TSA employee, a man, were not romantically involved.

The shooting occurred at a lot north of the airport in an industrial area along Interstate 480.