Police have interviewed several people in connection with the 131 E. Main St. fire late Sunday night that caused about $330,000 worth of damage.
Norwalk Police Detective Sgt. Jim Fulton said he has done several interviews, but declined to be more specific.
"The fire on Main Street in Norwalk is still under investigation. No origin or cause has yet been determined," said Shane Cartmill, the spokesman for the state fire marshal, via e-mail.
The homeowner, Doug Berry, was not home at the time of the fire, called in six minutes before midnight. He declined to comment Monday.
Neighbors said there was fire coming out of the back of the historical home and the front porch when firefighters arrived at 11:57 a.m. Gail Leto, of 129 E. Main St., who called 9-1-1, said she could feel the heat from her upstairs bedroom.
Capt. Tom Frey, in his report, said flames were coming out of the first floor windows on the west and rear sides of Berry's home when firefighters got there.
"We launched an aggressive attack using handlines and class 'A' foam to control the fire. (The) fire extended into the walls and stairways to involve the second floor," Frey wrote.
Firefighters had the blaze under control in less than an hour, but returned several hours later to extinguish a "rekindle" that went above the kitchen, extending into the attic.
Chief Doug Coletta has said the fire started on the west side living room and gutted the home built in 1878. Berry, the owner of Berry's Restaurant, has lived there between 15 and 20 years.
Frey's report indicates that the home, valued at about $229,000 with $100,000 worth of contents, was a total loss.