The two sons of Egypt's ousted president Hosni Mubarak, Alaa and Gamal Mubarak, will remain in detention despite a court ruling on Monday ordering their release.

A Cairo criminal court on Monday ordered the release of both men on grounds that they have spent the maximum legal time in detention for a re-trial on charges of corruption. 

Under Egyptian law, the maximum period for detention without conviction in a single case is 18 months.

Both sons, along with Hosni Mubarak, are accused of illegally obtaining LE45 million worth of properties from fugitive businessman Hussein Salem.

The former president's two sons, Alaa and Gamal – the latter having once been Mubarak's presumed heir to Egypt's top position – have been detained pending investigations since May 2011.

Despite Monday’s release order, both men are still facing a number of other charges which require they be detained.

They are due to stand trial on 11 June on charges of stock market manipulation. The case was adjourned last Saturday by a Giza criminal court.

Alaa, Gamal and six others, were referred to the criminal court on charges of violating stock market and central bank rules to gain LE 2.051 billion worth of unlawful profits through dealings in shares in Al-Watany Bank of Egypt.

Others who are standing trial alongside Mubarak's sons on the same charges include Yasser El-Mallawany and Hassan Heikal, board members and joint chief executive officers of Egyptian investment bank EFG-Hermes.

Alaa and Gamal Mubarak, as well as Hosni Mubarak, also face charges of illegally using funds allocated for expenditure on presidential palaces for their private villas.