Israel-Gaza updates: Israel says ground operation underway in southern Gaza

U.S. Secretary of State Antony Blinken departed Tel Aviv on Friday morning at 7:45 a.m. local time as the cease-fire between Israel an Hamas ended and the two sides exchanged rocket fire.

When Blinken left, Hamas and Israel were still indirectly communicating on hostages. But Hamas had not handed over a list of potential releases when hostilities resumed. The Palestinian militant group, which rules the neighboring Gaza Strip, alleged it doesn't have any women or children left among its hostages to release. But Israel doesn't believe Hamas and also wants to see men and soldiers freed as well.

So far, Hamas has not provided a list of potential releases for Friday.

After landing in Dubai, Blinken did not answer shouted questions from reporters on the tarmac about the end of the temporary truce. But a senior official with the U.S. Department of State expressed hope a pause in hostilities could be reinstated as soon as the end of the day.

When asked about a report by The New York Times alleging Israel knew about Hamas' attack plan a year in advance, the official told reporters that it was clear there was a massive intelligence failure and there needs to be a reckoning. The official added that Israel will do an inquiry but its leadership is trying to delay it.

-ABC News' Shannon Crawford and Morgan Winsor

The Israel Defense Forces says Hamas has "violated the operational pause in fighting by firing toward Israeli territory," and therefore, the IDF has "resumed combat against" the militant group.

Earlier Friday morning local time, the IDF said the Aerial Defense Array had "successfully intercepted a launch from the Gaza Strip."

A short time after announcing the cease-fire had ended, the IDF said fighter jets were "striking Hamas terror targets in the Gaza Strip."

-ABC News' Dana Savir

The six Israeli hostages released Thursday night as part of the deal between Israel and Hamas are on their way to hospitals, according to the Israel Defense Forces. They will be reunited with family members at that time, the IDF said in a release early Friday morning local time.

"The 6 released hostages are currently on their way from the Hatzerim Base to hospitals, where they will reunite with their families," the IDF said in the release.

The cease-fire between Israel and Hamas was extended Thursday for one day in part due to mediators, who brokered another day. No update was provided about what will happen on Friday.

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.