He turned up at the agency's Lahore office
The court has ordered to present Salman Shahbaz before the court on January 19.
The chairman NAB blamed money laundering for being behind poverty and lack of education and health facilities in the country.
We have concrete evidence of money laundering worth billions of rupees from the country, said the chairman NAB.
It further emerged that over Rs 30 billion was laundered abroad during the ongoing year.
Chief Financial Officer is responsible for the company's accounts, Shehbaz Sharif said during an investigation by the FIA at Kot Lakhpat prison.
The hearing was resumed by AC Judge Jawadul Hassan.
The notice sought an explanation from the brothers over transactions of large sums from their bank accounts.
All accused are currently being investigated for their alleged involvement in the sugar scandal and money laundering