The Income Tax department will soon summon former Jharkhand Chief Minister Madhu Koda for "detailed questioning" on alleged hawala transactions and investments made by him and his associates.

The department on Saturday carried out country-wide searches on at least 70 premises associated with Koda and seized voluminous documents, computer peripherals and other records pertaining to bank details and investments.

The department will issue notices to Koda and others for "detailed questioning" after the completion of scrutiny of the seized material, official sources said.

Some questioning at the time of searches was done by tax officials but they were largely cursory. A detailed questioning is required, as the documents taken into custody are huge, they said.

The notices will be send under section 131 of the Income Tax Act 1961 which authorises the department to issue summons or to force attendance of any person for being examined on oath or to compel production of books of account and other documents.

The I-T department yesterday had claimed that they found evidence of Rs 2000 crore in hawala transaction and investments after searches were conducted at Delhi, Kolkata, Mumbai, Lucknow, Nasik, Ranchi, Chaibasa and Jamshedpur.