MINNEAPOLIS (WCCO) — Authorities in Isanti County say a 74-year-old man died in a house fire on Saturday.

According to the Isanti County Sheriff’s Office, the fire was reported around 6:18 p.m. at a home on the 5600 block of 263rd Avenue NE.

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Upon arrival, deputies discovered a house fire and a male deceased inside the home. The victim was identified as 74-year-old Lawrence Tuma.

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Officials say upon further investigation it appears that the elderly man had tried to light a cigarette while oxygen was in use in his home which caused a flash fire.

According to the sheriff’s office, the victim died from smoke inhalation.

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The fire remains under investigation.