The accused were nabbed from a forest resort about 130 kms from Pune and all of them were taken into custody, they added.
Those under custody include Bharamagouda, four ofhis family members and his driver.
Four teams were formed to nab the MLA from Kagwad and 12 others, mostly his family members, who were named as accused in the case, police said.
Further legal procedures would follow, they said, adding that efforts were on to nab the others as well.
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CCTV footage of the alleged incident, which hadgone viral, showed a group of people with sticks barginginto Shetty's house and dragging him down the stairs.
Shetty was earlier with the BJP before getting associatedwith the Youth Congress.
Police had booked 13 persons on various charges under the IPC, including attempt to murder.