SANTA PAULA (CBSLA) — A woman faces charges of child abuse and arson Tuesday after firefighters responding to a house fire in Santa Paula found her son with a plastic bag over his head and his hands tied in a bedroom by himself.

Marical Magana, 47, was arrested after the fire was reported on Bahia Circle Sunday at about 6 p.m. Santa Paula police say a 911 call reported a structure fire with a woman tied to a bed and a young boy in another part of the home.

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Firefighters rescued Magana and her son and took them to Santa Paula Hospital to be treated for smoke inhalation. Santa Paula police says detectives determined she endangered her 3-year-old son by putting a plastic bag over his head and tying his hands before putting him in a bedroom by himself. Detectives were not able to determine a motive, police said.

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The cause of the fire remains under investigation. Anyone with information about the fire or Magana can call Detective Allen Macias at (805) 525-4474 ext. 220 or email allen.macias@spcity.org.

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Magana is being held on $550,000 bail, according to Ventura County sheriff’s jail records. She is scheduled to make her first court appearance Thursday.