The Nauru office of the group Save the Children has been raided reportedly because the charity is suspected of violating Nauru's Cyber Crime Act.
The news site, The Guardian, says police seized equipment after an email had been published which had been sent by the Nauruan manager of the Australian-run detention centre, Berilyn Jeremiah.
She has told The Guardian that the service providers who have leaked this information to the media are in breach of the Nauruan cyber law.
Save the Children says it has not leaked the email in question.
Last week, Nauru police reportedly seized computers, mobile phones and other devices including flash drives from the charity's office.
Last year, nine Save the Children staff were deported from Nauru after they were accused of encouraging detainees to self-harm and make up stories of abuse.
They were later cleared by a government inquiry.
