All prison officers from assistant officers upward should declare their assets and liabilities annually.
However, they are submitting false reports, the sources say.
The properties and vehicles they have acquired since taking up their jobs are not mentioned in these reports, as they are in the names of their wives, parents and children.
The sources say an investigation is underway into two officers who had bought properties from Ananda Rajakaruna Mawatha in Colombo and in Gampaha recently.