(KPAX) COEVALLIS - Three people died in a Corvallis apartment complex fire early Monday, and Ravalli County Sheriff Steve Holton said the fire is being investigated as "suspicious."

The blaze hit an apartment complex on Main Street in Corvallis at approximately 2:15 a.m. on Monday. Holton confirmed three deaths as a result of the fire. It is believed that all of the victims are adults.

Corvallis firefighters responded with mutual aid from Hamilton, Pinesdale and Victor fire departments and were able to contain the fire to one building.

The Ravalli County Sheriff's Office has directed all of its resources to the investigation and called for assistance from the State Fire Marshal and an independent fire investigator, according to Holton.

The identities of the victims are not being released at this time.

The fire had spread to a second apartment building, but those residents were able to be evacuated safely. The Red Cross responded to help the families that were displaced by the fire.

"Tragically, three people lost their lives due to this fire. The Ravalli County Sheriff's Office is thinking about and praying for the victim's families," Sheriff Holton said. "We have assigned the entire Detective Division to determine the cause of the fire."

Anyone with information regarding the fire is asked to contact Detective Lieutenant Jake Auch at 406-363-3033.