An officer at WA's Banksia Hill juvenile detention centre has been seriously injured after rocks and debris were allegedly hurled at him by a detainee, triggering the government to consider moving inmates to adult jails after they turn 18.
Premier Mark McGowan said a group of seven detainees had been out of their cells on Monday afternoon "undertaking some sort of recreation or other activities", before allegedly climbing up fences and onto the roof of a building at Banksia Hill.
