The agency claimed to have seized documents showing properties worth Rs 2 crore and bank deposits running into lakhs of rupees from Mittal during raids in Delhi, including at his North Block office, and in Uttar Pradesh.

Mittal is currently deputy director, establishment, at the Central Board of Direct Taxes in New Delhi. He has reportedly confessed he was offered huge bribes by the accused, Ulhas Prabhakar Khaire (33) and wife Raksha J Urs (30), who were arrested in November last year.

CBI will soon seek Khaire’s remand and confront him with Mittal. According to the CBI, Khaire told them that Mittal was part of the IT team that searched the Stock Guru premises in January 2011, and had helped him.

“We received the complaint from Delhi Police, after which surveillance was mounted on Mittal,” a CBI official said. Agency sources said Mittal never brought on record facts which could have exposed the scam. “He also allowed Khaire to show his income below what was found during the raids,” said an official.