Hamas said Sunday that negotiations in Cairo have concluded and that its delegation will leave Cairo tonight.

Israeli Defense Minister Yoav Gallant toured part of the Gaza Strip on Sunday before speaking with reserve fighters in the division's brigades, Israel's Ministry of Defense said in a statement.

"We recognize alarming signs that Hamas actually does not intend to go to any outline agreement with us, the meaning of this -- action in Rafah and the entire Gaza Strip in the near future," Gallant said, in part.

Several people were injured Sunday and sent to the hospital after approximately 10 "projectile launches" crossed from an area adjacent to the Rafah crossing toward Kerem Shalom on Sunday, the Israel Defense Forces said.

The Kerem Shalom crossing is now closed to humanitarian aid trucks, the IDF said.

According to the IDF, Hamas claimed responsibility for the attack.

-ABC News' Jordana Miller

Prime Minister Benjamin Netanyahu spoke Sunday regarding the talks for the release of hostages, claiming Hamas is "preventing the release of our abductees."

"Israel was and still is ready to make a truce in the fighting to free our abductees. This is what we did when we released 124 hostages, and returned to fight -- and this is what we are ready to do today," he said Sunday in comments translated from Hebrew.

Throughout negotiations, Israel has "demonstrated a willingness to go a long way," Netanyahu said, adding that Hamas "remained entrenched in its extreme positions, chief among them the demand to withdraw all our forces from the Strip, end the war and leave Hamas intact."

Netanyahu said Israel "cannot accept this," and that "surrendering to the demands of Hamas would be a terrible defeat."

"Therefore, Israel will not agree to Hamas's demands, which mean surrender, and will continue the fighting until all its goals are achieved," he added.

Netanyahu's comments come a day after an Israeli official told ABC News that Israel will not agree to end the war as part of any potential deal.

Meanwhile, Ismail Haniyeh, head of Hamas' political bureau, said Sunday that Hamas is keen on reaching a comprehensive cease-fire that "ends the aggression, guarantees withdrawal, and achieves a serious prisoner exchange deal."

-ABC News' Jordana Miller and Nasser Atta

The humanitarian pier being constructed off the coast of Gaza by U.S. soldiers is over 50% complete, deputy Pentagon press secretary Sabrina Singh told reporters Wednesday.

The pier, known as JLOTS, is on track to meet the early May time frame for delivery, she said.

"The floating pier has been completely constructed and set up. The causeway is in progress," she said.

Singh said the United Nations will be responsible for distributing the aid once the pier is open, and that the drivers of the delivery trucks will be from a third party and not U.S. forces.

When asked how security will be handled to prevent strikes on aid workers, Singh said the Israel Defense Forces "has shown that they are taking steps to mitigate that from happening again."

-ABC News' Nathan Luna