A 65-year-old man was arrested Monday on suspicion of sexually abusing a 10-year-old girl in Sarzana near Genoa.
The girl's parents reportedly left her in the man's care when they went to work, police said.
The probe was opened when police received a complaint from the girl's mother.
The man has been detained under house arrest pending the validation of his arrest warrant, police said.
Police said the girl told her parents about the abuse inflicted by the man, whom she called "granddad".
The probe turned up kiddy porn on the man's phone as well as social media profile she allegedly used to lure minors.
The man, who was in southern Italy at the time of his arrest, has been taken to his home where he has been fitted with an electronic ankle bracelet.
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