The Income Tax department has initiated a probe into the assets of Ranjit Singh alias Ranjit Don, the kingpin of the CAT paper leak racket now in CBI dragnet.

The I-T department would conduct the inquiry in association with the Central Bureau of Investigation and would ascertain whether the kingpin had been filing his returns regularly, Chief Commissioner of Income Tax (CCIT), Bihar, Ashutosh Singh Thakur told PTI on Thursday.

I-T departments in Mumbai and Delhi would be contacted to gather information regarding Ranjit's assets in the two metros and a notice would be served to Ranjit under I-T Act after collecting information about his tax returns, he said.

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Director (Investigation), Income Tax, Bihar and Jharkhand, Vijay Sharma has been entrusted with the task of looking into the returns filed by Ranjit during the past six years as per the amended provisions of Income Tax Act, 1961.

Sharma has been directed to get in touch with the CBI to acquire details of Ranjit's assets in Bihar, Delhi and Mumbai and other places across the country, Thakur said.

Ranjit, arrested from a Delhi hotel while leaking question papers on the eve of the Common Admission Test examination on November 23, reportedly owns luxurious houses in Mumbai, Delhi, Patna and his native place at Hilsa block of Bihar's Nalanda district besides a pharmaceutical firm in Mumbai.

Thakur said investigation into the assets of Ranjit's associates, who were arrested along with him, would follow.