Jamestown's assistant Fire Chief Tom Luckock says people at a restaurant on the building's third floor called the fire department when the fog filled the building Saturday about 5 p.m. The restaurant was hosting a 70th wedding anniversary party for a couple in their 90s at the time.
The building about 75 miles northwest of Pittsburgh is named for Twain because he was friends with the Dr. William Gibson, a physician and world traveler who built the home in the mid-1800s.
The video was being shot at a teen dance club in the basement of the building.
