There were tears, hugs and smiles as the four freed Israeli hostages greeted their families for the first time after 477 days in captivity.

A six-year-old was killed in Gaza just moments before the ceasefire was announced. She was one of, if not the last, child killed before the ceasefire. NBC News’ Raf Sanchez talks to her family and has the latest on the hostages in Gaza. 

Israel has released 200 Palestinians from its prisons as part of its agreement with Hamas.

The prisoners were brought to the Ofer and Ktziot prisons from various others around the country, and later released by authorities there, a spokesperson of the Israel Prison Service said in a statement.

Some of the prisoners released in the previous hostage exchange lamented the conditions inside Israeli prisoners, saying they were denied basic necessities, including food, clean supplies and clothing.

While Israel has branded the prisoners “terrorists,” they have not released details of their charges.

The U.S. is aware of Israel's decision to stop Palestinians from moving into northern Gaza, a senior Israeli official said.

Rear Adm. Daniel Hagari, a spokesperson for the Israeli military earlier accused Hamas of violating the ceasefire and hostage release deal by failing to release all civilian women ahead of female soldiers.

The senior officials said that the U.S. was “aware of the problem and are aware that there is a violation here that requires a settlement to Israel’s satisfaction.”

The four hostages have boarded an Israeli Air Force helicopter and are being taken to a hospital, the IDF said in a statement.

The hostages were transferred to the helicopter at the Reim military base in southern Israel where they arrived after meeting their family members at a reception point.

Red Cross buses believed to be carrying Palestinian prisoners have departed Israel's Ofer Prison in the occupied West Bank, the latest exchange as part of the ceasefire agreement. Hamas earlier released four female soldier hostages.

Footage captured by Reuters shows three buses moving away from the prison and through urban areas accompanied by a number of emergency vehicles, with cars honking their horns as people crowded the street around the convoy.

Israel has not yet commented on the release.

The Palestinian Prisoners Authority earlier released a list of the 200 prisoners expected to be handed over by Israel as part of the exchange. Of the 200 prisoners set to be released, 121 were serving life sentences, and 79 were serving long sentences.

The list also includes 70 prisoners who will be deported outside of Gaza and the West Bank, the authority said.

Hamas has “failed to meet its obligations” to first release Israeli civilian hostages as part of the ceasefire agreement, Rear Adm. Daniel Hagari, the Israel Defense Forces’ chief spokesperson, said Saturday.

Last week, Hamas released three women civilian hostages as part of an exchange for 90 Palestinian prisoners, but this week the militant group released four female soldiers, rather than a female civilian.

“We are determined to return Arbel Yehud,” he said. “And also Shiri Bibas and her two children, Kfir and Ariel, whose welfare we are extremely concerned about.”

Israel has said it will not allow Palestinian civilians to return to northern Gaza until Yehud’s release is arranged. It remains unclear why Yehud has not been freed.

The Israel Defense Forces said it is warning Gazans to avoid the area around the Netazarim corridor, a military zone in Gaza City that effectively separates northern and central Gaza, "until it is opened."

"The Chief of the General Staff addressed the IDF’s readiness along the Netzarim Corridor, emphasizing the preparedness and alertness of the troops in the area until decided otherwise," a statement from IDF read.

As part of the ceasefire agreement, Israel had been expected to pull pack some of its forces to allow displaced Gazans to head north. But that's now in doubt after Israel said it would not allow it until Arbel Yehud, a civilian hostage, is released.

In the past few hours we’ve seen a large presence of Hamas fighters gathered in Gaza city, clearly a show of force by the group despite Israeli claims they’ve killed around 20,000 Hamas operatives. 

The four hostages were brought on a stage, wearing what looked like military uniforms. They appeared well, the women waved to the crowd, at times even smiling and then were handed over to the Red Cross, and onward to Israeli forces.

There is no sense of chaos from the images coming out, in fact it all looked quite choreographed. A surreal, emotional scene for those watching here at Hostage Square in Tel Aviv. 

As for the American hostages. Keith Seigel, in his 60s, is expected to be released next Saturday, according to two senior officials. Sagui Dekel Chen, in his mid 30s, is to be released soon after. The remaining American hostages, dead or alive, are to be released in the second stage — if we get there. 

The release of both hostages is subject to confirmation from Hamas 24 hours before their release, in accordance with the deal.

There were reports that Hamas was going to provide an update on the condition of the remaining 26 hostages to be released in the first phase. We’re still waiting, as are their families who still don’t know with any certainty if they are dead or alive.