Egypt's authorities have extended the detention of former President Hosni Mubarak for another 15 days.

Essam al-Gohari, head of Illicit Gains Authority, ordered the detention of former president Hosni Mubarak for 15 days,” after his interrogation on Thursday.

Prosecutors interrogated Mubarak about attacks on demonstrators during the uprising that ended his three-decade rule and about a deal to export gas to Israel.

Mubarak is in custody at the Red Sea resort in Sharm el-Sheikh's military hospital after suffering from heart problems and was questioned there for three hours. Mubarak later will be sent to Tora prison south of Cairo for futher interrogations.

Mubarak’s two sons, Gamal and Alaa, who are also in detention, were arrested on April, 13 and are being questioned about alleged misuse of public funds and the violence against the protesters. Suzanne, his wife was also questioned by investigators for the first time.

Mubarak was forced out of power on Feb, 11 after an uprising in the country. He is also accused of involvement in the killings of anti-regime protesters.

More than 20 ministers and businessmen linked to the Mubarak’s regime have been seized since his detention.

Ahmed Nazif, ex-prime minister, is behind bars awaiting trial for corruption charges while Habib al-Adly, ex-interior minister was sentenced to 12 years imprisonment on charges of money-laundering, last week. He is also charged with  commanding troops to fire on protestors and if convicted could face a death penalty.

Youssef Boutros Ghali and Rachid Mohamed Rachid, ex-minister of finance and ex-minister of trade and industry respectively, have fled the country, but are expected to return to Egypt to face trial.