Officials with the Denison Fire Department say they are still working to determine the cause a fire that damaged two duplexes and a home near North Texas Regional Airport — Perrin Field and displaced two families on Saturday afternoon.

Fire crews from Sherman, Pottsboro, Preston, Denison and NTRA responded to the fire, which occurred in the 100 block of Doolittle and started shortly before 12:30 p.m.

“I haven’t been out there yet, but it sounds like the carport, storage area caught on fire first,” Denison Fire Marshal John Weda said, referencing the department initial report on the incident. “Then it got up in the attic and spread to the other side of the duplex.”

A resident of the affected 152-B Doolittle duplex, Vaness O’Quinn said she first became aware of the fire when smoke began to enter her residence from outside and set off her fire alarm. She and her three children were all able to make it out of the structure safely, but O’Quinn said the experience was one she never thought she would experience.

“You don’t expect this to happen to you,” she said. “You see it happen to other families, but you don’t expect it to happen so close to home.”

Denison Battalion Chief Bruce Geilhausen said the adjacent duplex unit also sustained damage in the incident, but did not catch fire. He said damage to the unit largely resulted from water, smoke and heat. Geilhausen said that the exterior of a nearby house also briefly caught fire in the blaze, but the flames were quickly extinguished and the homeowners were ultimately allowed to return to their residence. Those living in the two affected duplexes were displaced by the fire, but Geilhausen said the Red Cross was assisting them with temporary housing and necessities.

Denison fire officials said an initial inspection did not point toward any suspicious circumstances or evidence, but added that they would return to the scene on Tuesday to continue their investigation of the fire.