Tumakuru: The CID which is probing Chemistry question paper leak case, has taken two principals of private colleges into custody in Tumakuru on Saturday late night.

The arrested are said to have helped students by procuring question papers and selling it to them through tuition centers run by them.

The investigating officials have seized some of the documents in those centers. But, most of the documents were said to be destroyed soon after the scam blow up.

Meanwhile, CID is looking for few more key players in the scam.

CID had arrested three accused in the case, Manjunath, Obalaraju and Rudrappa, on Monday. Two PT teachers, Anil and Satish were arrested on Wednesday The suspected kingpin of the scam – Shivakumar Swamy, a former lecturer and also the prime accused in 2012 question paper leak case is yet to be traced.