At least 13 Palestinians were killed by Israeli artillery and aerial attacks between when the ceasefire was supposed to start, at 8:30am local time, and its actual start time at 11.15am. 

ABC journalists stationed at the border with the Palestinian enclave reported seeing and hearing air strikes hitting communities in Gaza.

Israel's military told Reuters it had carried out air and artillery strikes against "terror targets".

Most Palestinians across the Gaza Strip thought the ceasefire was going ahead as planned, and were unaware the Netanyahu government was not implementing it because it had not received the names of the female hostages to be released. 

The ceasefire that's been negotiated comprises multiple stages, the first of which will begin on Sunday.

During the first phase of the deal (expected to last several weeks), Israel will free 737 Palestinian prisoners from its jails.

It will also release 1,167 Palestinians detained by the IDF during its ground offensive in Gaza.

The prisoners won't all be freed at once. Israel's government has provided a list of 95 that it says it will release on Sunday.

So who's in line to be released during the first phase?

One of the most high-profile names on the list is Khalida Jarar, a politician and member of the Popular Front for the Liberation of Palestine (PFLP) and the Palestinian Legislative Council.

She's was detained in December 2023 and has been held by Israeli authorities since, but hasn't actually been charged with anything.

Another name on the list who's set to be released as part of the first phase of the ceasefire agreement is Zakaria Zubeidi, who rose to prominence during the Second Intifada as a leader of the Al-Aqsa Martyrs' Brigades.

The Second Intifada refers to a period between 2000 and 2005 in which Palestinians staged an uprising against Israel and it's occupation, with often deadly consequences.

The Al-Aqsa Mrtyrs' Brigades is a coalition of Palestinian armed groups in the West Bank and Gaza.

While he's been detained multiple times, his most recent arrest was in February 2019, and he was later that year charged with carrying out shootings at civilian busses in the West Bank.

He's also previously claimed responsibility for a terror attack in Beit She'an, Israel in 2002 in which six Israeli civilians were killed and 34 were injured.

With more hostages due to be released, the Netanayhu Government is insisting it's prepared to offer them whatever support is necessary.

But some who've already been through the process of mourning a missing loved one, and welcoming them back, are issuing a warning on that.

Aviram Meir's nephew Almog was rescued by the Israel Defense Forces (IDF) seven months ago.

Aviram says he's getting along fine after his ordeal, but his family are still suffering.

"My sister who was a mother of a hostage for eight months - a day after he came back, she's a normal citizen in Israel," he said.

"My sister now is breaking ... and we need the families strong for their hostages."

He said he dedicates his time to providing hostage families with support, and called on the government to do more.

One of the people attending the rally in 'Hostage Square' is someone with firsthand experience.

Louis Har spent 129 days in Hamas' custody, and was rescued by Israeli forces in a special mission in Rafah, southern Gaza.

The grandfather said the ceasefire and hostage deal was the right approach, because not everyone could be rescued by the IDF.

"It's not possible to take 98 people in a mission, only with a deal," he said.

He said his role now was to spread hope amongst the hostage families, and he believed the deal would hold.

"OK, this is the first list [of hostages], and we're waiting for more."

Clive has a question.

So, are they [the hostages] alive?

Hamas provided a list of 33 hostages that it plans to release as part of the first phase of this ceasefire. Their condition is not known (although, Hamas has previously said some of them are dead, without providing evidence of this).

Israeli authorities believe most of the people on the list are alive.

It's not clear if the three Hamas are planning on releasing later on Sunday, local time, are alive.

Hamas released a video of Doron Steinbrecher back in January 2024. That was the last time we heard from one of them as far as I'm aware.

It's also believed that the other two hostages set to be released, Romi Gonen and Emily Damari, were wounded when they were abducted by Hamas on October 7, 2023.

As the ceasefire came into effect, Israeli airforce pilots drew a symbol in the skies over Jerusalem, that's supposed to represent the hostages being held by Hamas in Gaza.

The yellow ribbon has been used by loved ones of those captured during the October 7 attack to raise awareness and build momentum to get them released.

Today's ceasefire is the first step towards freeing the nearly 100 hostages still held by Hamas. 

The first phase of the ceasefire, which will run for the next six weeks, will see at least 33 hostages released, mainly women, children and the elderly.

One of Prime Minister Benjamin Netanyahu's political rivals, Benny Gantz weighed into the ceasefire and hostage deal at the rally in Tel Aviv on Saturday night.

"We are strong enough to have a deal," he said.

When asked whether the government should walk back the ceasefire agreement, and commit to continue fighting in Gaza - as has been floated by far-right Finance Minister Bezalel Smotrich, Mr Gantz said Mr Netanyahu needed to remain focused.

"We have a Prime Minister with responsibilities, and I expect him to stick with them."

ABC News camera operator Haidarr Jones is on the Israel-Gaza border, where the destruction from IDF attacks in the Palesinian territory is visible.

We have an audience question, from Andrew, which I'm going to answer: 

Riley, hi! I dunno why, but this ceasefire 'feels' more fragile than most. There seem many fluid parts, and all appear very tenuously linked. Do you expect it to hold?

Andrew, you're right. This is a particularly delicate situation, although both Israel and Hamas have said multiple times they are committed to it.

From Israel's point of view, this is more of a "hostage deal" rather than a ceasefire. That's been made clear for several reasons.

As recently as last night, Israeli PM Benjamin Netanyahu said that his country would resume its attacks of the deal collapsed.

There is a difference as to how the governments in Israel and the US are interpreting this ceasefire. In Israel, they're stressing that it could be temporary. In the US, it's seen as something that should lead to a permanent end to this war.

To answer your question Andrew: I expect it to hold today, and in the medium term. After that, all bets are off.

These are the three hostages Hamas is planning to release today:

• Emily Damari
• Romi Gonen
• Doron Steinbrecher

Emily Damari is a British-Israeli who was taken hostage from Kibbutz Kfar Aza. She's 28.

Romi Gonen, 24, was abducted from the Nova music festival.

Hamas militants took Doron Steinbrecher, who is 31, from Kfar Aza.