Israeli Defense Minister Israel Katz asked the Israel Defense Forces to send a clear message to Hamas, urging their forces to immediately leave areas beyond the Yellow Line, adding that anyone who remain in the area will be targeted.

The IDF said it now believes the deadly attack in Rafah on Sunday was carried out by militants still in tunnels under Rafah, which is why Katz is calling for Hamas to evacuate the area controlled by IDF.

-ABC News' Somayeh Malekian and Jordana Miller

Two Israeli soldiers were killed "in combat" in southern Gaza on Sunday, according to the Israel Defense Forces.

Maj. Yaniv Kula, 26, and Staff Sgt. Itay Yavetz, 21, were killed in fighting in southern Gaza, according to the IDF. A reserve Israeli soldier in the Combat Engineering Heavy Equipment Unit was severely injured in the fighting in southern Gaza, the IDF also said.

The injured soldier, whose name was not released, was evacuated to a hospital for medical treatment and his family has been notified, according to the IDF.

Details were not released regarding how the Kula and Yavetz were killed, nor how the reserve soldier was injured.

-ABC News' Jordana Miller

An Israeli official confirmed to ABC News that a decision had been made earlier Sunday to close crossings into Gaza, halting aid from entering, but that the decision has since been reversed.

A political source familiar with the matter told ABC News that aid deliveries from crossings into Gaza were also temporarily stopped Sunday due to the bombing and that the Rafah crossing will remain closed for now.

“Due to the intense bombings and dozens of deaths on the Hamas side, Israel stopped truck traffic today, which will resume when the bombings end," the official told ABC News. "Rafah Crossing will only open when we see Hamas continuing to return the dead hostages at a reasonable pace.”

-ABC News' Jordana Miller

The Israel Defense Forces said Sunday that it has "struck dozens of Hamas terror targets" in Gaza.

"In response to Hamas’ blatant violation of the ceasefire agreement this morning, the IDF struck dozens of Hamas terror targets across Gaza," the IDF said in a social media post. "The strikes targeted weapons storage facilities, firing posts, terrorist cells and additional Hamas terror infrastructure."

"In addition, the IDF struck and dismantled ~6 km of underground terrorist infrastructure, used to advance attacks against Israel, using over 120 munitions," the post continued.

In an earlier post Sunday, the IDF said the strikes were "in response to the blatant violation of the ceasefire agreement earlier today."

Hamas has handed over a coffin to the Red Cross and it is now on its way to Israeli troops in Gaza, the Israel Defense Forces and the Israeli Security Agency said.

In a statement, Hamas said it "continues to uphold its commitment to implementing the ceasefire agreement in the Gaza Strip by handing over the body of another Israeli captive this evening and will continue working to complete the entire exchange process."