Official sources said the raids that began early morning yesterday went on till late in the night with the minister being grilled at his residence at a posh locality here and were continuing today as well.
In a swoop down that raised a political storm, theIT department had yesterday conducted searches at 64 locations and properties linked to Shivakumar in a tax evasion case.
He has been put in charge of 44 MLAs lodged in the resort, to keep the flock together for preventing the BJP from "poaching" on them ahead of the Rajya Sabha polls in Gujarat where Ahmed Patel, political secretary to Congress president Sonia Gandhi, is facing a tough battle.
The ruling Congress in Karnataka will be holding a protest in the city later today against the raids on Shivakumar, accusing the Centre of "dictatorial" attitude and "murderingdemocracy".
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Shivakumar, hailing from a modest agrarian family, is an influential Vokkaliga community leader and also one of the wealthiest state ministers in the country.
55-year old Shivakumar, considered a resourceful troubleshooter for the Congress with proximity to the party high command, is a six-time MLA.
He has also made known his chief-ministerial ambitions while making it clear he would bide his time.
IT officials had yesterday said a "good amount" of jewellery has been recovered from a teacher's locker in a college here, adding it is in the name of a relative of Shivakumar.
Certain investments linked to him in Singapore and few other foreign locations are also under the scanner of the department, they said, adding, some shell firms and their operatives allegedly linked to this case were being probed.
The raids at the resort had yesterday sparked a huge political row with Parliament getting disrupted and Congress calling it "unprecedented witch-hunt" to win one Rajya Sabha seat.
Chief Minister Siddaramaiah alleged it was a politically motivated action to silence the voice against the BJP.