CAIRO: The sons of deposed Egyptian president Hosni Mubarak face charges of trying to avoid questioning after registering some of their properties under the names of other individuals. Gamal and Alaa Mubarak denied all charges, saying they are unjustified. Both sons have properties in several governorates, including New Cairo, Sharm el-Sheikh, Hurghada, Ismalia, and Alexandria. General Prosecutor Abdel Magid Mahmoud passed a decision to extend the imprisonment of the two sons for another 15 days pending investigations on Monday. Regarding the case of gas export to Israel, investigations revealed that Gamal, Mubarak's younger son, received a 5 percent commission on the deal, as did businessman Hussein Salem. The former Minister of Petroleum, Sameh Fahmy, was excluded from investigations as Gamal took his 2.5 percent share as well. The deal said Egypt would export gas to Israel for 20 years. Israel was exempted from paying taxes by the former Egyptian government from 2005-2008. The exemption cost Egypt U.S. $718 million in losses. Gamal has denied all charges. Other documents revealed that Gamal was involved in privatization deals of public organizations and services with Egyptian businessmen, who then sold to foreign companies.