Three youths are in police custody after a fire at Tasmania's Ashley Youth Detention Centre. Photo: Ethan James/AAP PHOTOS

Three youths are in police custody after allegedly setting fire and causing "extensive" damage to a section of a troubled youth detention centre.

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Police and emergency services were alerted to reports three armed youths had set fire to part of the Ashley Youth Detention Centre, about 50km west of Launceston, on Sunday afternoon.

The trio were found unarmed in an outside area before they were taken into police custody, Tasmania Police said.

No one was injured du

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