ISLAMABAD: After a long interval of five years, former president Asif Ali Zardari will face six corruption cases in an accountability court on Tuesday (today). The National Accountability Bureau (NAB) has vowed to 'vigorously' pursue the cases and the main opposition PPP has decided to vehemently defend Mr Zardari. Sources in the NAB said the bureau, which is an investigation and prosecution agency, had made preparations to pursue the cases. "NAB Chairman Qamar Zaman Chaudhry has made it clear that he will not tolerate any leniency in pursuance of cases against Mr Zardari," an official of the bureau told Dawn. He said the NAB chief directed officials concerned in a recent meeting to honestly fight the cases. On Oct 11, the Accountability Court of Islamabad issued notices to NAB Prosecutor General K.K. Agha and Mr Zardari to attend the hearing of the cases on Tuesday.