Middle East updates: Israel-Lebanon ceasefire extended to Feb. 18

Israel says it won’t allow Palestinian civilians to return to northern Gaza until Hamas releases Israeli civilian Arbel Yehud, who Israel says was supposed to be freed Saturday as part of the agreement.

"Israel today received four female soldiers kidnapped from the Hamas terrorist organization, and in exchange will release security prisoners according to the agreed-upon key," read a statement from the Israeli Prime Minister's Office. "In accordance with the agreement, Israel will not allow Gazans to cross into the northern Gaza Strip - until the release of civilian Arbel Yehud, who was supposed to be released today, is arranged."

Hamas has yet to comment on the situation.

A joint statement from the Israel Defense Forces and the Israel Security agency confirms that the four newly released hostages have been “reunited with their parents” in southern Israel and “will undergo an initial medical assessment” at a local hospital.

"The four returning hostages - Daniella Gilboa, Liri Albag, Naama Levy, and Karina Ariev - have arrived at the initial reception point in southern Israel where they are being reunited with their parents," the statement said.

"IDF officers from the Manpower Directorate and IDF medical officials are accompanying the returning hostages, and they will undergo an initial medical assessment. IDF representatives are accompanying their families waiting at the hospital and updating them with the latest available information."

Israel Defense Forces spokesperson, Rear Adm. Daniel Hagari, gave a televised statement Saturday morning, in which he confirmed that the four female IDF soldiers who were just released from captivity in Gaza are now meeting with their parents in Israel.

Hagari said Hamas failed to meet its commitment to the agreement for Saturday to also release civilians and that they must free Yehud Arbel and Agam Berger.

He said the IDF also expects them to release Shira Bibas and her children, saying there’s grave concerns about their wellbeing.

He called the event in which Hamas brought the hostages onto a stage in a crowded square in Gaza City before releasing them a “cynical” show.

-ABC News' Jordana Miller

The Four returning hostages -- Daniella Gilboa, Liri Albag, Naama Levy and Karina Ariev -- have crossed into Israeli territory with IDF and ISA Forces, according to a statement from the Israel Defense Forces and the Israel Security Agency.

"A short while ago, accompanied by IDF and ISA forces, the four returning hostages crossed the border into Israeli territory," the statement read. "The returning hostages are currently on their way to an initial reception point in southern Israel, where they will be reunited with their parents."