THIS IS A RUSH TRANSCRIPT.  THIS COPY MAY NOT BE IN ITS FINAL FORM AND MAY BE UPDATED. LINDA STOUFFER, CNN ANCHOR: On to another story developing overnight, in Northern Ohio, preparations for a county fair turned tragic yesterday when something went very wrong with one of the exhibits. An antique steam engine exploded, killing four people, injuring dozens more. It happened in Medina, that's just west of Akron, Ohio. CNN's Denise Dillon has more on this story.</s>DENISE DILLON, CNN CORRESPONDENT (voice-over): Not your typical county fair scene, more than 100 fire and rescue personnel rushing to the Medina County fairgrounds in Ohio. An antique steam engine was being moved to an outdoor exhibit when it exploded. Pieces of the engine were found in a parking lot about 100 yards away. Some standing in the immediate vicinity were hit by hot metal pieces, others burned by hot oil and steam.</s>CHIEF WILLIAM HERTHNECK, MEDINA FIRE DEPARTMENT: There's evidence of hot oil being pushed out of this thing probably 50 feet away, maybe 75 feet away in big volumes. So anybody who was just walking by could have been very seriously burned.</s>DILLON: Ambulances from surrounding towns and helicopters from as far away as Pittsburgh were called in to help get the injured to hospitals. Medina General Hospital activated its emergency preparedness plan to handle the dozens of people injured with burns and lacerations. Investigators have no idea how it happened. They say everything was moving along as planned until the blast.</s>UNIDENTIFIED MALE: This is a piece of antique - an old antique steam engine tractor that is routinely here and they were starting it up and running it as they always do and the tractor exploded. So there was no fire afterwards, there was - the injuries were all immediate.</s>DILLON: The fair was only open for preliminary events. Organizers say it will go on this week as scheduled. Denise Dillon, CNN.
Antique Steam Engine Explodes at Medina County Fair, Kills Four