Police reportedly seized "several documents" as a result of their search.
A number of documents seized by authorities were in his handwriting.
The federal agents seized Archer's computer files and other documents.
At the time of Cabrera's arrest, army special forces also seized documents and computer equipment, he said.
They seized documents, maps, photographs and videos at the location, the military said.
Some 300 investigators had acted in concert across the country to seize computers and documents.
Turkish police had since seized documents relating to a series of planned attacks, the source added.
A parliamentary committee of inquiry can also conduct searches and seize documents.
Police also seized arms, explosives, land mines and documents.
The agency said its agents were sent to about 10 sites early today, seizing documents and searching for evidence of the stock scheme.