A former guard working for Wilson Security has told a Senate committee about waterboarding of asylum seekers at the Nauru detention centre.
The committee also heard how Wilson Security changed their staff members' phones from iPhones to old Nokias in 2014, so they couldn't take pictures or videos.
John Rogers, executive manager at Wilson Security was next to give evidence and said the torture claims were "preposterous" and "absurd".
Immigration minister Peter Dutton dismissed the claims on Thursday afternoon.
Alexandra Lee is a politics reporter for BuzzFeed News and is based in Sydney, Australia.
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