Israel-Gaza updates: Police killed in border shooting, authorities say

Vice President Kamala Harris and second gentleman Doug Emhoff spoke with the parents of Hersh Goldberg-Polin, an American-Israeli hostage who was found dead in Gaza on Saturday along with five other Oct. 7 hostages, according to the Israel Defense Forces.

The vice president and her husband called parents Rachel Goldberg and Jon Polin on Sunday to "express our condolences following the brutal murder of their son by Hamas terrorists," Harris said in a statement on X.

"My heart breaks for their pain and anguish," Harris continued.

"I told them: As they mourn this terrible loss, they are not alone. Our nation mourns with them," Harris said.

Protesters took to the streets of Tel Aviv Sunday night, demanding a cease-fire agreement and the release of the remaining hostages being held by Hamas terrorists.

The demonstration came a day after Israel Defense Forces recovered the bodies of six hostages in tunnels under the city of Rafah in the Gaza Strip.

Protesters were seen waving Israeli flags as they demanded a cease-fire agreement, chanting "Deal. Now."

-ABC News' Victoria Beaule

At least six people were killed on Sunday when Israel Defense Forces conducted an airstrike on a school in Gaza City, according to Gaza Civil Defense.

The IDF said in a statement that the strike was aimed at Hamas terrorists they allege were operating a command-and-control center inside the Safad school to plan and carry out terrorist attacks against the IDF and Israel.

"Prior to the strike, numerous steps were taken to mitigate the risk of harming civilians, including the use of precise munitions, aerial surveillance, and additional intelligence," the IDF said in a statement.

The Gaza Civil Defense confirmed the Safad school was hit in the IDF strike, but said the school houses displaced people from the Al-Zeitoun area east of Gaza City.

-ABC News' Victoria Beaulé