I monitor WHIO radio over the internet at times and this morning I understand that a small roof fire was discovered in a portion of the arena this morning at about 6 AM.
I also heard that they attempted to put it out using a fire extinguisher but needed a fire hose. It appears that a large fire response was made regrading the situation. As of 7 AM I believe the fire is out and they had to peel back about a 6 foot section of roofing material.
That's all I know at this time!
Not as bad as when part of the steel structure collapsed when I was there in 1968/69!