Detectives have stepped up the probe of former First Lady Mrs. Patience Jonathan by retrieving her service records from the Government of Bayelsa State.
The retrieval of her records is part of the screening of her salary and emoluments as a retired permanent secretary to determine whether her earnings could match the 13 assets traced to her.
Besides the assets, the former First Lady is laying claim to $15.5m in some domiciliary accounts.
The anti-graft agency has written the Rivers State Ministry of Lands and Survey for details on some assets linked with the former First Lady and a former Minister of Petroleum Resources, Mrs. Diezani Alison-Madueke, in Port Harcourt, the Rivers State capital.
But officials have blocked access to the documents.
Some of the officials may be investigated for obstructing justice, a source said last night.
It was unclear yesterday whether or not the said officials were acting on orders.
A source close to the investigation said there was no where in the records where the ex-First Lady earned foreign exchange as emoluments and estacodes amounting to over $15.5million she is claiming to own.