GREENFIELD — Fire investigators with the Greenfield Fire Department and state police were unable to pinpoint the cause of the blaze that burned through the upper floors of an apartment building at 75 School St. Sunday morning, leaving it uninhabitable.

According to Jake Wark, public information officer with the Massachusetts Department of Fire Services, the Greenfield Fire Department and state investigators assigned to the State Fire Marshal’s office determined that the fire started inside a wall on the second floor of the building, and no evidence was found to suggest it was intentionally set.

“While they could not rule out some kind of electrical event they were unable to reach a conclusive determination,” Wark wrote in an email.

Although the blaze was not directly attributed to an electrical issue, Wark mentioned that electrical fires can be dangerous, as they can smolder inside a wall or ceiling for a long time before someone becomes aware of the fire.

“Especially in older homes, it can be helpful to have a licensed electrician check your home’s wiring every 10 years or so to identify issues before they become emergencies,” Wark noted.

On Monday, Greenfield Fire Chief Robert Strahan said the building has been deemed uninhabitable after the fire. He said five people were evacuated from the building at the time of the fire on Sunday morning. An exact number of tenants is unknown, although one, Genesis Stevens, said seven people lived in the building.

Additionally, Strahan said two firefighters sustained non-lifethreatening injuries after a partial collapse of the building temporarily trapped them until one was able to self-extricate, and another was able to get out with the help of another crew member. Strahan did not provide the names of the two firefighters, but he said that one was back to work on March 3.

On Sunday, Greenfield Fire Capt. Alex Cooley said the call for service came in at 6:04 a.m., and multiple fire departments responded. By 8:30 a.m., firefighters were still on scene, and battled the fire from ladders with Northfield and Turners Falls units.

The structure contains five apartments on the corners of School and Osgood streets, and firefighters were seen dousing the building from truck ladders on the roof of the building with smoke coming from all sides. A gray cat was rescued from the building by units from Orange Engine 3, according to a post on the Orange Fire and EMS Facebook page.

Fire departments from Bernardston, Northfield, Gill, Erving, Turners Falls, Deerfield, South Deerfield and Orange responded to the fire along with ambulances from Northfield, Orange and AMR Ambulance. The Massachusetts Department of Fire Services Special Operations unit, Greenfield Police and the Greenfield Department of Public Works (DPW) were also on scene Sunday morning.

GoFundMe pages have been set up by loved ones of the tenants, with monetary and materials donations being requested. Stevens and Matthew Colby were impacted by the fire in their apartment on the second floor of the building. In a phone interview with Stevens, she said herself, Colby and their dog were able to get out of the house when the fire started above them and were uninjured.

Stevens said their apartment was mostly impacted by water damage and ice buildup from the freezing temperatures. Important documents were the only things they were able to salvage, she said, while the rest of their belongings were destroyed.

Stevens said a close friend set up the GoFundMe for them called “Rebuild Hope for Matt and Genesis” with a goal of $6,000. She said they plan to use donations for essentials like food, clothes, bedding and other supplies.

Sarah Perry of Greenfield organized a GoFundMe for her friend, Kyle Wilder, who lost all of his belongings in his upstairs apartment in the fire, including his military gear as he is a reserve member of the United States Marines.

In a phone call with Perry, she said that he was unable to retrieve belongings from his apartment on the upper floors of the building. Right now, the monetary goal is $10,000, and people are able to also donate basics like toiletries and gift cards to stores for food and clothing necessities. For these in-person donations, she said to use the “Contact” tab on the donation page to reach out to Perry about planning for dropoff and pickup of items.

A third GoFundMe has also been set up for two tenants, Jessica Gaines and Kevin Griffin, by Maggie Paddock titled “Help Jessica and Kevin Rebuild After Fire” with a $2,600 monetary goal. In a phone call with Gaines, she said that she and her fiancé plan to use the money to replace the items they couldn’t save from their apartment.

To donate to the GoFundMe page for Wilder, visit https://gofund.me/e396d968. For Stevens and Colby, visit https://gofund.me/bea6f91c. For the GoFundMe for Gaines and Griffin, visit https://gofund.me/39365985.

Erin-Leigh Hoffman can be reached at ehoffman@recorder.com or 413-930-4231.