15-year-old boy arrested on suspicion of murdering parents and siblings in Fall City, Washington.

A 15-year-old boy has been arrested in Fall City, Washington, on suspicion of murdering his parents, Mark and Sarah Humiston, and three siblings in their home. The victims were discovered shot dead, while an 11-year-old sister survived and is hospitalized. The suspect, whose name is withheld due to legal reasons, is expected to face multiple murder charges. The incident is being investigated as a case of domestic violence involving firearms.