A 14-year-old survivor of the Oct. 7 Hamas terror attack described how she hid in a safe room in her kibbutz for hours in an interview with ABC News' Kayna Whitworth on Thursday.

"The fear of what might happen -- that was the most terrifying part," Eli Shani Kozin said on ABC News Live.

While she hid, hearing gunfire and knocks at their door, Eli said she would see messages on WhatsApp from other children sharing what happened to them, such as seeing their houses set on fire.

"I kind of accepted death. I felt like, there's no way I'm going to get out of here safely," said Eli, whose father was killed and cousin kidnapped on Oct. 7.

At a news conference in Israel on Thursday, Secretary of State Antony Blinken reiterated that "Israel has the right to do everything it can to ensure that the slaughter Hamas carried out on Oct. 7 can never be repeated."

"Hamas cannot remain in control of Gaza," Blinken said, but he reiterated Israel’s obligation to minimize civilian casualties in the Gaza Strip.

He said he told Israeli Prime Minister Benjamin Netanyahu and Netanyahu's war cabinet that it's imperative that "the massive loss of civilian life and displacement of the scale that we saw in northern Gaza not be repeated in [southern Gaza]."

"We made clear the imperative that before any operations go forward in southern Gaza, that there'd be a clear plan in place that puts a premium on protecting civilians, as well as sustaining and building on the humanitarian assistance that's getting into Gaza," Blinken said. "And the Israeli government agrees with that approach.”

-ABC News' Nate Luna

Six more Israeli hostages were released Thursday evening and are back in Israel, according to the Israeli prime minister's office.

They were identified as: 29-year-old Shani Goren, 41-year-old Nili Margalit, 30-year-old Ilana Griczewski Kimchi, 29-year-old Sapir Cohen, 18-year-old Bilal Elziadna and 17-year-old Aisha Alziadna.

This comes hours after two other Israeli hostages were released: 21-year-old Mia Schem and 40-year-old Amit Sosna.

In exchange for the eight hostages released Thursday and two Russian citizens who were released Wednesday, Israel will release 30 Palestinian prisoners -- 23 minors and seven women -- on Thursday, according to the Qatari foreign minister.

Amid the cease-fire, the Israeli military is prepared to continue the war and forces are prepared to strike at any hour, Israel Defense Forces spokesman Daniel Hagari said.

Israel insisted on continuing the cease-fire -- which was extended by one day early Thursday morning -- "to bring back the hostage women and children, and this is what we will do [Thursday night] for tomorrow, as well," Hagari said in Hebrew.

"The mediators, Qatar and Egypt, are also obligated to carry out the set agreement in order for the pause to continue," he said.

The United States will send three relief flights into Egypt on Tuesday to keep up the flow of humanitarian aid into the war-torn Gaza Strip, which has reached its highest levels as officials take advantage of the current humanitarian pause.

"The movement over the last four or five days of assistance has been so significant in volume that a backfill in El Arish [International Airport in Egypt] is now needed, and these planes are part of that backfill," a senior Biden administration official told reporters during a telephone call on Monday afternoon.

Some 800 trucks carrying aid have crossed into Gaza during the first days of the pause, officials said, which is a huge increase from the days prior. So far, a total of about 2,000 aid trucks have entered Gaza since Oct. 7, meaning that 40% of them had gone in in just the last four days.

The planes on Tuesday will be carrying medical aid urgently needed in Gaza as well as food, particularly for children, and winter clothing as the rainy season begins, according to officials.

The aid will be delivered by the United Nations to civilians.

Two more planeloads are expected to follow in the coming days, officials said. Previously, there were also five commercial flights of aid coordinated by the U.S. government, according to officials.

The officials emphasized this aid as part of U.S. President Joe Biden’s commitment to helping the Palestinian people, saying that he has made sure America is the largest single donor both to the United Nations Relief and Works Agency for Palestine Refugees in the Near East (UNRWA) and to Palestinian territories.

Going forward, the officials said the goals for humanitarian aid in Gaza will be expanding access, pushing for restoration of essential services, especially water, and keeping civilians out of harms way.

"The president has also consistently stressed the importance of ensuring military operations are conducted in a manner consistent with international humanitarian law, including with respect to the protection of civilians," the senior Biden administration official told reporters.

Officials did not offer any new information on the hostage negotiations between Gaza's militant rulers, Hamas, and Israel but reiterated that they hope to see Americans released in the coming days.

-ABC News' Cheyenne Haslett and Morgan Winsor