Lancashire fire deaths tragedy: 18-year-old arrested
The teenager, from Lytham, has been arrested on suspicion of murder and is currently in custody.
Police can now confirm the fire was started inside a wardrobe in one of the bedrooms at the house in Lytham Road.
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Hide AdDetective Chief Inspector Neil Esseen said: “I can confirm this fire is now being treated as suspicious. We are following a number of lines of inquiry and have spoken with a number of people who were at the house on the night in question.
“However, I would still urge anybody who has any information which they believe could assist us with our investigation to come forward.”