Former President Hosni Mubarak is in Sharm el-Sheikh International Hospital and will be sent to prison when his health conditions improve, a security source said.
The hospital is currently under heightened security since Egypt's attorney general ordered Mubarak's detention pending further investigations, the source said.
Attorney General Abdel Meguid Mahmoud ordered Mubarak's imprisonment early on Wednesday after the former president was questioned at the same hospital Tuesday.
Mubarak faces charges of corruption and of involvement in orders to shoot at protesters during the 25 January revolution. He reportedly had a heart attack on Tuesday while being questioned, but doctors have said it is safe for investigations to continue.
