Scores of Palestinians who had fled to the southern Gaza Strip amid Israeli bombardment were seen trying to return to the north on Friday, following the start of a four-day ceasefire between Israel and Hamas.

This came despite a warning from the Israeli military not to head toward the main combat zone in northern Gaza and there are Israeli checkpoints in place to prevent people from doing so.

"The northern Gaza Strip area is a dangerous war zone and it is forbidden to move around," the Israel Defense Forces said in a statement on Friday morning. "For your safety, you must remain in the humanitarian zone in the south of the Strip. It is only possible to move from the north of the Strip to its south via Salah al-Din Road."

-ABC News' Nasser Atta, Morgan Winsor and Sami Zayara

Footage from the Egyptian-controlled Rafah border crossing showed aid trucks entering the war-torn Gaza Strip on Friday morning.

Egypt's State Information Service said earlier Friday that 200 trucks transporting humanitarian aid, four trucks carrying gasoline and 130,000 liters of diesel would be allowed to enter Gaza via the Rafah border crossing during each day of the agreed upon cease-fire between Hamas and Israel.

That would be an increase from an initial average of around 70,000 liters of diesel that Israel agreed to deliver into Gaza over the past week to meet humanitarian needs set by the United Nations, but would still be well below what aid organizations say is required for daily critical needs.

Egypt will also allow hundreds of Palestinians stranded in the country to re-enter Gaza for the first time since the war broke out, according to the State Information Service.

-ABC News' Ayat Al-Tawy and Morgan Winsor

The transfer of 39 Palestinian inmates from Damon and Megiddo prisons to the Ofer camp in the West Bank has begun, a spokesperson for the Israel Prison Service told ABC News on Friday afternoon.

Once in the West Bank, the Palestinian prisoners will be released within two hours after the confirmation that 13 Israeli hostages were freed by Hamas in the Gaza Strip and returned home, the spokesperson said.

-ABC News' Yael Benaya and Morgan Winsor

Thirteen people are on a list of hostages who are expected to be released by Hamas in the Gaza Strip on Friday amid a temporary cease-fire, but it remains unclear exactly how many the militant group will free, according to Israel's Government Press Office.

During a press briefing on Friday morning, the Israeli Government Press Office said that the hostages who are released will be received by staff from the International Committee of the Red Cross, who will then take the hostages across the border and hand them over to the Israeli military. It was unknown which of Gaza's borders the hostages would cross -- either into Egypt or Israel.

From there, the Israel Defense Forces will identify each hostage who was released and the individuals will undergo medical examinations. Then they will be allowed to speak with their families via telephone, according to the Israeli Government Press Office.

The hostages will be transferred to one or more of five designated hospitals, depending on their medical needs. They will be physically reunited with their families at the hospitals, the Israeli Government Press Office said.

Among the freed hostages, children will not be debriefed by Israeli authorities but their mothers and other women who are capable will be, according to the Israeli Government Press Office.

-ABC News' Jordana Miller, Dana Savir 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