American-Israeli hostage Edan Alexander freed from Hamas captivity

American-Israeli hostage Edan Alexander, who had been held captive by Hamas in Gaza since Oct. 7, 2023, was released on Monday after successful negotiations between the U.S. and the terrorist organization.

The International Committee of the Red Cross transferred Alexander from Gaza to Israeli authorities, the organization said.

Alexander is "on his feet," and he's talking, Dr. Hagar Mizrahi, head of the General Medical Division of the Israeli Ministry of Health, said during a press conference from Ichilov Hospital after Edan was transferred to the hospital from Reim Military Base.

An Israeli official told ABC News, Alexander, 21, got to speak to his mother, Yael, by phone for the first time when he was in the IDF convoy.

"You are strong, you are protected, you are home," Yael told him over the phone, according to a video released by the Israeli prime minister's office. "We will meet soon. Love you."

Alexander was first taken to Re'im Military Base in Israel for a medical assessment and to be reunited with his family, the IDF said, and then was taken to Ichilov Hospital in Tel Aviv.

When Alexander hugged his little brother, he exclaimed, "You're huge! My gosh!"

Israeli security officials told ABC News there would be a temporary pause in combat, airstrikes and aerial reconnaissance in the area of Gaza where 21-year-old Alexander was to be released. The pause was scheduled to last until Alexander crosses into Israeli territory, officials said, which is expected to take less than 30 minutes.

Alexander, a New Jersey native, moved to Israel at the age of 18. He was serving in the IDF when captured from his base close to the Gaza frontier during Hamas' Oct. 7 attack.

He was 19 when abducted and has had two birthdays while in captivity.

Alexander was the last living American citizen still believed to be held hostage by Hamas. The terror group is believed to also be holding the bodies of four dead American hostages, according to U.S. officials.

Alexanders supporters have gathered in Tel Aviv and in Tenafly, New Jersey, to celebrate his release.

Israeli Prime Minister Benjamin Netanyahu in a video message called Alexander's release "a very moving moment."

Netanyahu on Monday met with Witkoff and U.S. Ambassador to Israel Mike Huckabee, per a readout from his office. Netanyahu also spoke with President Donald Trump, the statement said, with the Israeli leader thanking Trump for his assistance in securing Alexander's release.

"The prime minister discussed the last-ditch effort to implement the outline for the release of the hostages presented by Witkoff, before the escalation of the fighting," the statement said. "To this end, the prime minister instructed that a negotiating delegation be sent to Doha tomorrow."

"The prime minister clarified that the negotiations will only take place under fire," it added.

Trump, who's hosted Alexander's parents at the White House multiples times, said Monday before his release, "They thought he was dead just a short while ago. His parents are so happy."

"He's coming home to his parents, which is really great news," Trump said.

Trump wrote on Truth Social that Alexander's release "is the first of those final steps necessary to end this brutal conflict."

Hamas announced its intention to free Alexander on Sunday, describing the decision as a "part of the steps being taken to achieve a ceasefire."

The statement said Hamas has been in contact with American officials "over the past few days" as part of ceasefire negotiations.

A U.S. official familiar with the deal to release Alexander told ABC News that the agreement came together in recent days via direct talks between the U.S. and Hamas.

Alexander's release is being viewed as a goodwill gesture toward the Trump administration and a potential opening to jumpstart talks surrounding the broader conflict, U.S. officials told ABC News.

Still, officials said the U.S. did not secure all the concessions it was seeking. Negotiators had also been pushing Hamas for the release of the remains of the four dead American hostages still held in Gaza, officials said.

The Hostages and Missing Families Forum said in a statement that "Edan's release is a ray of light and hope, but also a stark reminder" of the remaining hostages still being held.

The hostage families also issued a statement addressing Netanyahu directly, urging him to "announce tonight that you are ready to negotiate a comprehensive agreement to bring home all 58 hostages and establish a framework for ending the war."

Israeli Defense Minister Israel Katz in a statement promised Israel is "committed to acting in every way until all the abductees, our brothers and sisters, both living and dead, return to their homeland."

New Jersey Gov. Phil Murphy also celebrated his release, saying in a statement, "With every day that Edan has been held hostage, the Alexander family has endured unimaginable pain, uncertainty, and fear. With Edan's return home, their -- and our -- prayers have finally been answered."

"We continue praying for Edan and the Alexander family," the governor said, adding, "We are also praying for the safety and well-being of every remaining hostage and innocent family in Israel, Gaza, and the entire Middle East."

United Nations Secretary-General António Guterres in a statement through his spokesperson welcomed Alexander's freedom and renewed "his urgent call for an immediate and permanent ceasefire."

He also said "aid is not negotiable" and called for "all parties to immediately ensure the rapid, unhindered and safe humanitarian relief" be transferred to "all civilians in need."

Fifty-seven hostages remain in Gaza, including 20 who are believed to be alive.

Alexander was one of the 253 hostages taken during Hamas' Oct. 7 attack, in which some 1,200 people were also killed, according to Israel.

Israel's subsequent offensive in Gaza had killed 52,829 people and wounded 119,554 more as of Sunday, according to figures released by the Hamas-run Ministry of Health in the strip.

ABC News' Emily Shapiro, Shannon Kingston and Michelle Stoddart contributed to this report.