This article was published in the daily newspaper The Cincinnati Post, Ohio, USA, on August 30, 1973.
The explosion-like noise which rattled parts of Greater Cincinnati about 10:30 a.m. today was public enough, but the cause of it may be top secret.
Persons living in the eastern portions of Hamilton County and northern Kentucky heard the rolling boom for about one minute. Some thought it was an explosion.
Joseph Skurka, an air traffic controller at Lunken Airport, said officials of the Indianapolis Air Route Traffic Control Center expected supersonic military aircraft in the area this morning.
"But they said everything else was classified," he said. The Indianapolis Center controls all air flights in the Ohio, Kentucky and Indiana area, Skurka said.
