Who are the hostages being released in the Israel-Hamas ceasefire deal?

After being held by Hamas terrorists for 470 days, the first three hostages released on Sunday as part of the ceasefire deal were reunited with their mothers and airlifted to a hospital, according to Israeli officials.

The now-former captives -- Romi Gonen, 24; Emily Damari, 28, and Doron Steinbrecher, 31 -- were turned over by Hamas to the International Committee of the Red Cross as part of the ceasefire and hostage release deal that has been in the works for months.

"Today's ceasefire in Gaza and the release of hostages is a result of a principled and effective policy that we've presided over for months," President Joe Biden said in an address from the White House on Sunday. "And we got it -- we got here without a wider war in the Middle East [that] many predicted."

The first phase of the deal will see the release of 33 hostages being held in Gaza, dead and alive, starting with women, children and the elderly, officials said. Hundreds of Palestinian prisoners being held by Israel will also be released in exchange for the hostages. Biden said that by the 16th day of the deal, talks will begin about the second phase of the agreement, which will include releasing remaining Israeli male hostages, civilians and soldiers.

Israel and Hamas reached a ceasefire deal on Wednesday, marking an end to more than 15 months of deadly conflict. The agreement was announced in Doha, Qatar, after months of negotiations between Israel and Hamas were mediated by facilitators from the United States, Egypt and Qatar. It was approved by the Israeli Cabinet on Friday.

Here's what we know about the freed hostages so far:

Romi Gonen, 24

Gonen was kidnapped on Oct. 7, 2023, from the Nova music festival that was attacked by Hamas terrorists, according to the Hostages and Missing Families Forum Headquarters.

Gonen, of Kfar Vradim in northern Israel, is known for her love of dancing, traveling and enjoying life, according to the organization. One of five children of Meirav and Eitan Gonen, Romi Gonen was described by the organization as energetic, funny, family-oriented and full of life.

Doron Steinbrecher, 31

Steinbrecher is a veterinary nurse who has cared for animals since childhood when she helped at the school's petting zoo, the organization said. She loves sports and was known to jog every Saturday morning around her kibbutz, according to the group. Her family described her as a devoted aunt, who is beloved by her nephews. Her parents are Roni and Simona, and she has one sister, Yamit, and a brother, Dor.

Steinbrecher is an Israeli-Romanian dual national who turned 31 in captivity, officials said.

Steinbrecher and Damari were both captured on Oct. 7 by Hamas militants who attacked their Kfar Aza kibbutz close to the Gaza border.

Emily Damari, 28

Damari is a British citizen who was living at the Kfar Aza kibbutz. Her friends describe her as well-loved and popular, a friend to everyone, according to the Hostages and Missing Families Forum Headquarters. The organization said Damari enjoys barbecuing and karaoke nights, and loves hats.

Damari was also a central figure in the local Kfar Aza youth community and was praised for always being there for her friends, the group said.

Damari was kidnapped from her home along with Steinbrecher and two other friends, Gali and Ziv Berman, who remain in captivity, the organization said.

In over a year of war between Israel and Hamas, more than 46,000 people have been killed in Gaza and almost 110,000 injured, according to the Hamas-run Gaza Health Ministry. That figure does not distinguish between civilians and combatants. However, more than 14,000 children and 8,000 women have been killed, according to the health ministry.

The Israel Defense Forces said they have killed more than 15,000 combatants throughout the course of the war, which was sparked by the unprecedented Hamas terrorist attack on Oct. 7, 2023, in southern Israel. More than 1,200 people were killed and another 253 were taken hostage, according to Israeli authorities.

During a weeklong ceasefire between Hamas and Israel in late November 2023, Hamas freed more than 100 people. In exchange, Israel released more than 200 Palestinians from Israeli prisons. Several hostages in Gaza have also been freed in the months since, while the bodies of others have been recovered.

The release of three American-Israeli hostages who are alive will be included in the ceasefire agreement, though in two different phases, a senior White House official told reporters on Wednesday.

Sagui Dekel-Chen, 36, and Keith Siegel, 65, are both expected to be released, with Sigel qualifying for release due to age, and Dekel-Chen qualifying because of injury, according to the official, who said Dekel-Chen was shot on Oct. 7, 2023, when the conflict began with a terrorist attack by Hamas in southern Israel.

Edan Alexander, 20, will be in the second phase of releases because of his service with the IDF, according to the official. The official said he spoke with Alexander's father recently and that the U.S. remains fully committed to getting him released.

"We are committed to getting all Americans, these are American-Israeli citizens, all of them out of Gaza, whether living or remains. That is our commitment," the official said.

Following the ceasefire announcement last week, Biden released a statement noting how American citizens held hostage by Hamas will be included in the ceasefire release agreement.

"This deal will halt the fighting in Gaza, surge much-needed humanitarian assistance to Palestinian civilians and reunite the hostages with their families after more than 15 months in captivity," Biden said in a statement.

Biden said he is determined to bring seven American hostages home, three of whom are believed to be alive, he said.

Hostages with American citizenship who have died and whose bodies are believed to remain with Hamas include Itay Chen, 19; Omer Neutra, 22, and married couple Judith Weinstein, 70, and Gadi Haggai, 73.

ABC News' Molly Nagle and Kelsey Walsh contributed to this report.