Investigations into a fire at an old library in Middlesbrough have concluded that is was stated deliberately.
It happened on Beresford Crescent in Thorntree on Monday 29 April.
No arrests have been made in connection with the fire and enquiries are continuing.
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Robert Hodgson, from Stanley, County Durham, committed the offences on the girls, aged as young as five or six, up to the age of 13.