A joint operation by Papua New Guinea's immigration, labour and police departments has exposed an alleged scam involving production of fake passports, visa and work permits by foreigners.
Police, accompanied by labour and immigration officers, raided a home in Port Moresby last week and confiscated computers and printers they suspect were being used to produce fake PNG passports and work permits.
Also discovered were hardcover papers used as covers of passports.
The newspaper, The National, reports foreign passport labels such as US passports were confiscated.
One of the officers involved in the raid says four foreigners had been questioned and placed under house arrest.
The officer says the Labour and Immigration departments had often been blamed for the high influx of foreigners especially from Asian countries.
But he says it is organised criminal syndicates that are producing false work permits and passports for them to come to PNG.