Investigators say a fire that damaged a North Texas prep school was set intentionally.
Nobody was injured in the Jan. 26 blaze that destroyed the main building at Selwyn College Preparatory School in Denton.
Fire Marshal Rick Jones says testing of a carpet and nearby materials indicated a flammable liquid was used to fuel the blaze that last month was said to be electrical in nature.
The Denton Record-Chronicle reports the lab results came back Tuesday.
Early Tuesday, a report from the Associated Press said investigators had ruled the cause of the fire to be arson. Wednesday afternoon, investigators told NBC 5 that they have not yet ruled the cause of the fire to be arson -- but did say they believe it was set intentionally.
Authorities say no one has been arrested over the fire that broke out before classes began for the day.
NBC 5's Frank Heinz & Sara Story contributed to this report.