"No role of any officer or employee of Commission or government was found in the paper leakage," IG, STF Sujit Pandey told reporters here.
"This is a local matter and the three arrested by the STF have told that they had made the plan two days before the PCS examination," Pandey added.
He said the three accused Vishal Mehta, Jai Singh and Gyanendra had taken photographs of question papers one and a half hours before the examination and circulated it through WhatsApp messenger.
"It's also not clear as to how many candidates they have sold the papers," he said.
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The three accused would be taken into remand for further probe and all those who got the question papers on WhatsApp would be made accused in the case.
As the accused had deleted all their messages on WhatsApp, help of experts would be taken to trace them, Pandey said.
The paper of PCS preliminary examination was yestedray leaked on WhatsApp in Lucknow after which the authorities today cancelled the examination of General Studies (1) paper.