NASHVILLE, Tenn. (AP) — Damage was estimated Wednesday at up to $750,000 as a result of a gas explosion at the sprawling Gaylord Opryland Resort and Convention Center. No injuries were reported after the Tuesday night blast, though 5,000 guests were evacuated for as long as seven hours. The hotel resumed normal operations Wednesday at 7 a.m. Fire officials said the explosion was caused by a gas leak that ignited inside a mechanical room on the first floor in the convention center portion of the hotel and away from guest rooms.