Up to 20 families had to be evacuated when firebugs torched a disused student block in Deepdale.
Firefighters spent more than 12 hours at the scene on St Barnabas Place after the fire broke out at 7pm on Friday.
Five youths - aged 13 to 15 - have been arrested on suspicion of arson and were due to be quizzed by detectives on Saturday.
Five arrested in arson dramaHave you been affected by the fire? Do you have pictures or video footage of the incident? Email andy.sykes@lep.co.uk or call (01772) 838107.>> Vote in our latest web poll
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