Only a matter of time before someone is killed in Australian immigration detention, detainees say

As average detention period blows out to a record 700 days, people inside say centres are rife with violence, drugs, and overcrowding

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People held in Australia's immigration detention centres say violence inside has become so normalised that it's only a matter of time before someone is killed.

Severe overcrowding, the easy availability of drugs and an influx of 501s" - non-citizens who have had their visas cancelled for a criminal conviction - have made conditions inside centres such as Sydney's Villawood intolerable, detainees say.