Israel-Gaza updates: 17 more hostages released, including 4-year-old American girl, officials say

The families of American hostages said they are "thrilled" 50 hostages are expected to be released, but added, "We are not going to rest until every single hostage is returned"

The families also said they "request an immediate update on whether our family members are alive and well."

The families thanked President Joe Biden for his work on the hostage deal, adding, "We call on all world leaders to continue prioritizing this goal."

The whereabouts of nine U.S. citizens and one U.S. permanent resident are unknown, according to White House national security adviser Jake Sullivan. He said it's unclear whether they were among the hundreds of people who were taken hostage by Hamas.

"We don't know for certain that all 10 are still alive and we’ve been honest about that -- what we know and what we don't know," Sullivan told ABC News' "Good Morning America" on Wednesday. "We know that among those 10, three are women and children -- two women one child. And we believe that those three will be among the 50 who are released."

"Until we actually see them come out, be in the arms of their loved ones, get home safely, we cannot be fully confident," he added.

3:18

At least 3 American hostages expected to be released by Hamas Three Americans are now expected to be part of an initial release of dozens of hostages after Israel and Hamas agreed to a temporary pause in fighting.

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Approximately 75 Palestinian women, five teenage girls and 200 boys -- mostly teenagers -- are detained in Israel, according to a spokesperson for Addameer, a group which monitors the treatment of Palestinian prisoners.

Before the Israel-Hamas war broke out on Oct. 7, about 150 Palestinian boys, as well as 30 women and girls, were in Israeli prisons, the spokesperson said.

According to the newly brokered deal, 150 Palestinian prisoners would be released by Israel in exchange for at least 50 hostages released by Hamas. The deal also includes a four-day pause in hostilities.

Jan Egeland, secretary general of the Norwegian Refugee Council, said in a statement that the planned four-day pause in hostilities "is not enough time to address the immense needs after six weeks of fighting, bloodshed, and destruction."

Egeland said the pause "must pave the way for a lasting cease-fire."

"Small shelters have housed scores of people, with little food and water and mounting health hazards. Children are traumatized, and many face a future without their parents and siblings," Egeland said. "They need urgent, long-term help. This can only happen through a sustained cease-fire."

3:09

Unprecedented humanitarian crisis in GazaAs fighting continues, civilians face malnutrition, dehydration and unsanitary conditions. UNICEF spokesperson Ricardo Pires joins ABC News to discuss.

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In the wake of the approved hostage deal, in which Hamas would release 50 of the approximately 236 people taken hostage from Israel, the Israeli Hostage Center said in a statement, "There is no victory until every last hostage returns home."

The release of the at least 50 hostages would come over the course of a four-day pause in hostilities, Israel's prime minister said, and as a part of this deal, 150 Palestinian prisoners will also be released by Israel.

The hostage center said it demands "the current cease-fire terms ensure both security and welfare for remaining hostages held by Hamas, including the promised Red Cross visits."