The father-son appeared before an accountability court in Lahore earlier today, where they were indicted in the Ramzan Sugar Mills corruption reference.
Both Shehbaz and Hamza pleaded not guilty to the charges.
The National Accountability Bureau in February had filed a reference against the two alleging that the former chief minister of Punjab misused his authority by using public funds for the construction of a bridge to facilitate the Ramzan mills, owned by his sons.
The Lahore High Court on February 14 had granted bail to Shehbaz in the Ashiana Iqbal Housing scheme and Ramzan Sugar Mills cases.
The opposition leader was earlier indicted in the Ashiana scheme case.
Hamza Shehbaz was granted pre-arrest bail till April 17 by the LHC, which also restrained NAB from arresting him in cases pertaining to ownership of assets beyond means, until further notice.
Hamza was also directed to submit bail bonds worth Rs10 million.
NAB carried out two successive raids on Friday and Saturday at PML-N President Shehbaz Sharif’s Model Town residence to arrest Hamza.
A NAB team seeking Hamza’s arrest had a nearly five-hour-long standoff with his private security and party supporters, with the situation resolving only after the LHC restrained the watchdog from arresting Hamza and granted him protective bail until April 8.