LAHORE: PML-N President Shahbaz Sharif`s sons Hamza Shahbaz and Salman Shahbaz -did not appear before the National Accountability Bureau (NAB), Lahore, on Tuesday in connection with an investigation into the construction of a bridge in Chiniot.

NAB summoned both brothers, directors of Ramzan Sugar Mills, for their alleged role in the construction of a Rs200 million bridge to facilitate their mills from the public money.

An official source said Mr Sharif approved the construction of the bridge which NAB calls illegal. Hamza (opposition leader in the Punjab Assembly) was in Islamabad to attend the party meeting while Salman isin London. NAB has also summoned a director of the Ramzan Sugar Mills on Wednesday.

NAB has also summoned the brothers tothe headquarters on Nov 2 in an inquiry into the assets beyond means of Shahbaz Sharif. Shahbaz`s son-in-law Imran Ali Yousuf, wanted by NAB in Saaf Pani Company and Punjab Power Development Company cases, is reportedly hiding in London.

Earlier, Salman has appeared before NAB regarding provision of the property record of his family.

In a previous notice to Salman, NAB said: `During interrogation accused Shahbaz Sharif has stated that all of his matters relevant to assets, income and expenditures are being looked after by you and you are acquainted with and in possession of such information/documents. You are requested to appear before a combined investigation team along with documents of all assets, properties including those sold out here or abroad, documents pertaining to sources of income, complete income tax returns and wealth tax returns, details of investments/shareholding in companies in and outside Pakistan.

The bureau on Oct 5 arrested Mr Sharif in the Ashiyana-i-Iqbal housing project scam. The opposition leader in the National Assembly is remanded in NAB custody till Nov 7.