Middle East live updates: Siegel's family thanks President Trump 'for bringing our father back to us'

The Palestinian Prisoners’ Club, an advocacy group representing both former and current Israeli-held Palestinian detainees, said those who were released Saturday as part of the deal were severely beaten before their release and that some sustained fractures to their ribs.

When asked for comment on the allegations, the Israel Prison Service told ABC News: “The Prison Service is an organization that is part of the security organizations and operates in accordance with the law, under the strict supervision of numerous official visitors. All prisoners are held in accordance with the law, while ensuring their basic rights and under the supervision of a professional and trained staff of guards. We are not familiar with the events described and, as far as we know, no such events have occurred in IPS facilities. However, every prisoner or detainee has the opportunity to submit their claims in designated places and there they will be examined.”

The family of newly-released hostage Keith Siegel has released a statement, saying they are "filled with indescribable excitement" and thanked President Trump "for bringing our father back to us."

"At this very moment, our father is setting foot on the soil of the Land of Israel, and we are filled with indescribable excitement. Finally, after 484 long, terrifying days and nights, full of immense worry for our father, we can breathe again," the statement read.

"Thank you President Trump, for bringing our father back to us. There are now 79 hostages who are also waiting to be reunited with their loved ones. Our hope rests with you. We also wish to thank the governments of Israel and the United States for bringing this blessed deal to fruition—a deal that prioritizes human life and embodies Jewish and Israeli values."

"We are grateful to the incredible IDF soldiers and security forces who risk their lives and bodies, and we send our condolences to the bereaved families who have lost their most precious loved ones for the sake of us all," the statement continued. "You will forever be in our hearts. Only together can we bring everyone home!"

American Keith Siegel has been released from captivity Saturday morning.

His release took place in Gaza City where he was taken onto a stage wearing a cap, flanked by masked and armed Hamas forces with the waters of the Mediterranean and the destroyed port behind them.

A crowd watched calmly from a short distance away while Hamas photographers on stage and drones above filmed the release.

Siegel walked on his own power and he will now undergo medical checks before being reunited with his family shortly.

“According to information communicated by the Red Cross, one hostage was transferred to them, and they are on their way to IDF and ISA forces in the Gaza Strip,” read a joint statement from the IDF and the ISA.

Two returning hostages are currently being accompanied by IDF special forces and ISA forces on their return to Israeli territory, where they will undergo an initial medical assessment.

"A short while ago, the returning civilian hostages, Ofer Kalderon and Yarden Bibas, crossed the border into Israeli territory accompanied by IDF and ISA forces.," according to a joint IDF and ISA Announcement. "The returning civilian hostages are currently on their way to an initial reception point in southern Israel."