National Accountability Bureau (NAB) chairman Javed Iqbal on Wednesday approved registration of the corruption case during an executive board meeting.
The Sharif brothers have so far not reacted to the new allegations of corruption.
Officials said the NAB in the same meeting also approved filing of six corruption references, complete four pending inquiries, and 11 investigations against different politicians and officers.
NAB will also launch investigations into alleged corruption by another former premier Yousaf Raza Gilani who was disqualified by the apex court in 2012 and replaced by Ashraf. (MR, Inputs: Agencies).