Transparency International Papua New Guinea says questions remain over a suspicious land deal involving at least two government ministers.
The deal involved the acquisition of land in Central Province for a naval base over which defence minister Fabian Pok and state enterprises minister William Duma were alleged to have conspired.
The state paid a company linked with Mr Duma $US14m to purchase the land at Manumanu.
When the deal came to public attention in March, prime minister Peter O'Neill stood down the ministers, and announced an inquiry.
Both MPs have now been re-appointed as ministers, but according to Transparency's Lawrence Stephens, questions over their involvement in the deal have not been answered.
"We haven't got any information coming back from any inquiry yet. If anything's happened, it certainly hasn't happened publicly, and we don't even know whether the person who was named as being appointed to head the inquiry has actually been permitted to arrive in the country yet."