ZINTAN, Libya -- The imprisoned son of Libya's slain dictator Moammar Gadhafi has appeared in court on charges of harming state security, but the judge adjourned his hearing until Sept. 19 to allow defence lawyers time to study the case.

Seif al-Islam Gadhafi, the ousted leader's longtime heir apparent, wore a sky blue suit and a pair of sandals. He remained standing throughout the 15-minute hearing in the western Libyan town of Zintan on Thursday.

It was his second court appearance since the case opened in January. He is also facing charges of attempting to escape prison and insulting Libya's new flag.

The charges are separate from those by the International Criminal Court, which indicted Seif al-Islam for the murder and persecution of protesters in the uprising that ultimately toppled his father's regime.