
Searches were conducted at Han's private home and his former official residence as prime minister in central Seoul.
The raid came just about three weeks after Han was questioned for about 14 hours earlier this month.
Prosecutors allege that Han conspired with Yoon and former Defense Minister Kim Yong-hyun to prepare documents related to Yoon's Dec. 3 declaration of martial law, which eventually led to Yoon's ouster from office in April this year.
Han, mindful of possible controversy, has also been accused of destroying the documents.
But he reportedly denied all allegations, claiming that he only learned of Yoon's plan to declare martial law when a late-night cabinet meeting was convened that day, despite CCTV footage and other evidence suggesting otherwise.
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