A fire early Monday that damaged a vacant Gwinnett County house was deliberately set, according to investigators.

The blaze in the 2700 block of Cardinal Lake Circle near Duluth was reported by a neighbor just after 2 a.m., Gwinnett fire Capt. Tommy Rutledge said.

Firefighters found the fire burning in the basement, with flames burning a hole through the floor on the main level, Rutledge said.

“This is now an active arson case,” Rutledge said in a Monday morning e-mail. He asked that anyone with information on the fire call investigators at 678-518-4890.

There is a reward of up to $10,000 posted by Georgia Arson Control Inc. for information leading to an arrest and conviction in arson cases, according to Rutledge.