It's believed a senior police officer and a lawyer representing anti-corruption police in Papua New Guinea are next in line to be arrested and charged with lying under oath.
The director of PNGs fraud and anti-corruption squad, Mathew Damaru, was arrested and charged with giving false evidence on the weekend.
Senior fraud squad member Thomas Eluh says it's over an affidavit Mr Damaru gave in relation to contempt charges against the police commissioner Gari Baki.
Mr Eluh says they have reliable information that another fraud squad member, Timothy Gitua, will be charged with the same offence, along with lawyer McRonald Nale.
Mr Eluh, who was last month sacked by the Commissioner of Police, says it makes it hard to do their jobs.
"We have suddenly become targets and it's really infringing on our progress in terms of our investigations, yes."
Meanwhile, the Post Courier newspaper reports that one of the two Australian lawyers who had been banned from entering PNG has now arrived in Port Moresby.
Greg Egan had been engaged to represent PNG's anti-corruption body and senior police officers in cases against politicians, including the Prime Minister Peter O'Neill, when a travel ban was imposed five weeks ago.
That ban was suspended by the National Court on Friday
His colleague, Terence Lambert, is yet to arrive in the country.