A 48-year-old woman was arrested on suspicion of setting her home on fire Saturday near Snohomish.
The woman’s roommate was not home at the time, according to a probable cause affidavit made available Monday.
The fire started around 12:40 p.m. Fire crews saw flames reaching out a window of the mobile home along 171st Avenue SE.
The suspect was watching from outside, according to court papers. She allegedly used a lighter to ignite curtains in a bedroom, fire officials said.
Investigators said the heat and smoke damage, along with charring on the ceiling, confirmed the flames originated near a bedroom window. There was $50,000 in damage.
The woman was booked into the Snohomish County Jail for investigation of first-degree arson.