BILLERICA (CBS) – Firefighters in Billerica had to contend with massive piles of what officials described as “clutter” blocking their way as they battled flames inside a home that caught fire on Saturday morning.

The fire, at 12 Autumn Street, is believed to have started in the basement sometime around 7:45 a.m.

READ MORE: Betty White Challenge: Support For Animal Shelters Encouraged On Late Star's 100th Birthday

Officials say firefighters first attempted to go into the house through the front door, but the entrance was blocked.

They eventually managed to get into the home through a rear door.

The homeowner, an elderly female, escaped the fire safely.

READ MORE: Long List Of Patriots Players Set To Hit Free Agency In 2022

There were three cats inside the house, two of which died. The third cat is missing.

Officials say a responding firefighter was injured when he fell down a flight of stairs. Officials blamed the fall on the excessive clutter.

The cause of the fire is under investigation.

The Board of Health has also been called in to work with fire inspectors.

MORE NEWS: Thousands Left Without Power Following Monday Storm

[display-posts category=”local” wrapper=”ul” posts_per_page=”4?”]