A Nigerian man serving a jail term for online fraud has seized $ 1 million from the prison.
Anti-corruption officials said Hope Olusegun Aruk used a network of people who had colluded with him to carry out the fraud.
He was arrested in 2012 and was serving a 24-year sentence in the high-security Kerikeri prison, but it became clear from an investigation that he had access to the Internet.
Nigeria's Financial and Economic Crimes Commission said it had received an intelligence report on the fraud and was puzzled as to how the prisoner could continue the fraud from inside the prison.
When he was arrested, he said, he was a student in Malaysia and was the "spearhead" of a fraud network operating across two continents.
UNHCR learned that Aarok had a chance to use the Internet, although the laws did not allow it.
The prisoner was also able to enter the hospital for unclear reasons, stay in hotels, meet his wife and children and attend social events.
He used a false name, Akinwonmi Surinmied to open two bank accounts, buy a luxury car and houses during his stay in prison, and used his wife's bank account to make money transfers.
Anti-corruption officials are investigating why he is hospitalized and how he can stay in hotels.
Some believe that Aroki was able to carry out all the above activities with the help of corrupt officials inside the prison.
Online crooks in Nigeria are wealthy and can easily bribe low-paid prison officials.
So far, no prison officials have been frozen in the background, and the Financial and Economic Crimes Commission has promised a full investigation into the case.
It was also unclear whether UNHCR had changed prison guards, which was outside its jurisdiction.