PORTLAND, Ore. (KOIN) — Fire officials said three people were treated for smoke inhalation following an apartment fire in Beaverton Tuesday morning.

Shortly before 9:30 a.m., Tualatin Valley Fire & Rescue tweeted that crews were responding to the building on Southwest Davies Road, just off of Southwest Scholls Ferry Road. Fire crews told KOIN 6 that the blaze started in a garage before spreading to multiple surrounding units.

Multiple crews worked quickly to keep the flames from moving to additional units. Fire crews say the residents had already quickly evacuated after the smoke alarms went off, one resident also pulled the manual fire alarm, contributing to the swift exits.

Fire officials reported that eight units experienced fire, smoke, and water damage. Twenty residents were displaced, and three people at the scene suffered minor injuries. A total of eight units experienced fire, smoke and water damage.

TVF&R investigators revealed that the fire was caused by accidental and improper disposal of fireplace ashes. Officials urge individuals to dispose of fireplace ashes in a secure metal container with a lid that does not sit near any easily-flammable materials.