An early-morning fire in a vacant Clinton home late last month was intentionally set, law enforcement and fire officials say.

Clinton police Sgt. Tom Bohle confirmed Thursday that the police department is involved in an investigation into the May 23 blaze at 849 11th Ave. South.

“We are actively, jointly investigating this with the fire department,” said Bohle. “I guess if I can say anything, it would be that we are investigating this as an arson...We know it’s a set fire.”

Bohle said no arrests have been made in connection with the fire, and could not reveal if the police department has identified any suspects in the case.

Clinton Fire Marshal Mike Brown said this morning that he has conducted numerous interviews related to the case.

He said the electricity and gas in the home were shut off before the fire, which pointed to the blaze being suspicious in nature.

Brown could not give details about the accelerant possibly used to set the fire, adding that investigators are still waiting for results from samples taken from the fire scene and sent to the crime lab in Ankeny. He said the home had been locked up before the fire.

Firefighters were dispatched to the home at 2:44 a.m. on May 23, finding heavy flames in the rear of the house with the blaze extending to the second floor.

In addition to sending a ladder truck and two engines, the fire department called in additional off-duty firefighters to assist. One firefighter suffered heat exhaustion on the scene and had to be treated at Mercy Medical Center.

The home was covered by insurance, with the fire causing about $30,000 in damage. The homeowner, who moved out of the 11th Avenue residence late last year and lives at a separate address in Clinton, filed a report with police following the fire.

Brown asked anyone with information about the case to call the police department at 243-1458 or the fire department at 242-0125.