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Kerry said Egypt's foreign minister will invite the ceasefire parties to take part in "serious" negotiations in Cairo and that the United States plans to send a small delegation. He called the ceasefire "precious time."
"It is a lull of opportunity, a moment for the different factions to be able to come together with the state of Israel in an effort to try to address ways to find a sustainable ceasefire and then obviously, over a longer period of time, address the underlying issues," Kerry told reporters.
Kerry said the United States is grateful that the violence and bloodshed can stop for more than 24 hours. "We hope that this moment of opportunity will be grabbed by the parties, but no one can force them to do that, obviously," Kerry added.
"There are no guarantees. This is a difficult, complicated issue, years and years in the building, and I think everybody knows it has not been easy to get to this point. Everybody knows it will not be easy to get beyond this point, but it is imperative people make the best effort to try to find common ground and do so," Kerry added.
A senior US State Department official said the Gaza talks could start as early as Friday, depending on how long it takes the parties to reach Cairo. The official said representatives from Israel and the United States will not sit across the table from Hamas in Cairo.
The official said Palestinian President Mahmoud Abbas will be responsible for naming the Palestinian delegation for Cairo but will not attend the talks.
Kerry said that as soon as the ceasefire is under way, Egypt will issue invitations to the parties to come to Cairo immediately in order to engage in serious and focused negotiations with Egypt to address the underlying causes of the conflict.
Israel and Islamist militant group Hamas agreed to the 72-hour humanitarian ceasefire in their conflict starting on Friday, Kerry and U.N. Secretary-General Ban Ki-moon said earlier.
Kerry said the parties need to find a way to address Israel's security concerns and to ensure that the people of Gaza can live in safety and dignity.
"All the people involved in this have strong demands and strong visions on what the future should look like. Israel has to be able to live in peace and security, without terror attacks and rockets and tunnels and sirens going off in the day," Kerry said.
"And Palestinians need to be able to live with the opportunity to educate their children and move freely and share in the rest of the world and lead a life that is different from the one they have long suffered," Kerry added.