UPDATED: Heaters looked at in Lancaster Tri-County fire
A dispatcher at the Coos County Sheriff's Office confirmed that the fire was at the Tri-County CAP building at 79 Main St.
She said all available police and fire personnel were at the scene of the fire, which was reported shortly before 8 p.m. Wednesday.
"It's across the street from the theater," he said.
In addition to the Tri-County Cap building, Fuller said a thrift store and apartments on the second and third floor of the building were involved, as was an empty storefront.
In June 1996, a blaze destroyed four Main Street businesses, including the Lancaster Diner and Lancaster Fruit and Deli. Eighteen months later, the owner of one of the destroyed buildings was charged with two counts of arson. After an unprecedented four trials, he was found innocent in 1999. The diner has never been rebuilt and the lot remains empty.