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."

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."

IDF and Hamas continued hostilities hours after reaching a deal for a temporary truce and the release of some of the hostages being held by Hamas.

Israel's Cabinet voted to agree to the deal with Hamas early Wednesday morning, however, the temporary cease-fire has not started yet. The cease-fire was expected to begin Thursday, however, in a late Wednesday night update, Israeli officials said it would start Friday and no hostages would be released until then.

The Israel Defense Forces confirmed in a statement early Wednesday that it "is continuing to operate in the Gaza Strip, including striking terrorist infrastructure, killing terrorists, and locating weapons."

"This morning, IDF troops neutralized a terror tunnel shaft from which a Hamas terrorist exited and fired at the soldiers," the IDF said. "Moreover, IDF troops identified terrorists and located weapons in a structure used by the Hamas terrorist organization. The troops killed the terrorists and destroyed the structure."

Rockets launched by militants continued to be fired toward Israel on Wednesday.

The deal between Israel and Hamas was mediated by Egypt, Qatar and the United States. Israeli law requires a 24-hour waiting period after the vote before the agreement can be put into action, during which time the Supreme Court of Israel may need to get involved in the event of any legal challenges. However, it is expected that the cease-fire and the prisoner swap will begin Thursday morning.

This post has been updated for clarity.

-ABC News' Joe Simonetti and Morgan Winsor

President Joe Biden said Friday that the release of 24 hostages held by Hamas in Gaza is "just the beginning" of a plan to free 50 of the more than 230 captives over four days.

“It's only a start, but so far it's gone well,” Biden said in a televised address from Nantucket, Massachusetts, where he and first lady Jill Biden are vacationing.

He said Friday's hostage release is part of a deal "reached by extensive U.S. diplomacy, including numerous calls I've made from the Oval Office to leaders across the region," including calls with Israeli Prime Minister Benjamin Netanyahu, Egyptian President Abdel Fattah El-Sisi and the emir of Qatar.

“All of these hostages have been through a terrible ordeal, and this is the beginning of a long journey of healing for them,” Biden said. “Today has been a product of a lot of hard work and weeks of personal engagement.”

Biden said that under the deal, more hostages would be released over the next three days with 50 being "our goal." But he added, "We also will not stop until we get these hostages brought home and an answer to their whereabouts.”

The president said U.S. officials do not know when Americans -- including two women and 4-year-old Abigail Edan, whose parents were killed by Hamas terrorists -- will be among those that are released or their conditions. He added, “We expect it to occur” and that it’s his “hope and expectation” that it “will be soon.”

Biden said the four-day cease-fire that was negotiated for the release of the hostages will allow time to "accelerate and expand humanitarian assistance going into Gaza."

Speaking of the children freed on Friday, one just 2 years old, Biden said, “The teddy bears waiting to greet those children at the hospital are a stark reminder of the trauma these children have been through at such a very young age.”

-ABC News' Justin Gomez