On Friday, April 18, three youths allegedly damaged a bookshelf and televisions.
They are reportedly being managed by the Department of Corrective Services.
Inmates were moved back to the centre in October after a multi-million dollar upgrade after a riot that caused significant damage.
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READ NOWThere are about 5140 prisoners in the WA prison system, with Banksia Hill the only detention centre for youths aged from 10 to 17 years in WA.