Hundreds of Palestinians are being freed in exchange for Israeli soldier Gilad Shalit under the deal between Gaza's Hamas rulers and the Israeli government.
Cairo airport raised security to emergency level as it prepared to transport 40 of the Palestinians to three countries as part of the swap deal, the intelligence source said.
The source said the prisoners were being sent to Turkey, Syria and Qatar and that their travel formalities were being overseen by Hamas leader Khaled Meshaal.
A Turkish Foreign Ministry official confirmed that Turkey had agreed to receive some of the prisoners because it would contribute to peace in the region.
"As we have always said, we're looking at this issue as a humanitarian issue," the Turkish official said. "Our contribution to this agreement will be to receive a group of Palestinians in Turkey."
A plane would be sent to Egypt to fly the Palestinians to Turkey, the official said on condition of anonymity, without giving further details.