Strikes in multiple neighborhoods across northern Gaza today have killed 42 people according to Gaza's Civil Defense. Videos from the immediate aftermath of the strike show an entire building leveled, children covered in dust.

A bombing of Al-Shati camp killed 24 people, a bombing in Al-Tufaah killed 18 people -- the number of casualties is likely to increase -- and a bombing in Al-Zaytoun killed 7 people, according to Civil Defense.

Fifty others were injured in the attacks, according to the Hamas media office.

Several others are still trapped under the rubble.

The Israel Defense Forces told ABC News they struck two Hamas military infrastructure sites in Gaza City.

While addressing Israel's parliament on Monday, Israeli Prime Minister Benjamin Netanyahu said he remains "committed" to the Israeli hostage/cease-fire proposal that President Joe Biden had presented.

"Will not end the war until we return all the abductees -- 120 abductees -- both the living and the dead. We are committed to the Israeli proposal that President Biden welcomed. Our position has not changed," Netanyahu said.

He added, "We will not end the war until we eliminate Hamas and until we return the residents of the south and the north safely to their homes. … [And] we will thwart Iran's intentions to destroy us."

Senior Hamas official Khalil Al-Hayya told Al Jazeera on Monday evening that "Netanyahu's statements confirmed our view that he does not want a cease-fire or the return of [Israeli] prisoners. … Netanyahu's real stance is that he wants to retrieve his prisoners and continue the war."

"We are ready for genuine negotiations if Netanyahu adheres to the principles outlined by President Biden," he said. "We are ready for negotiations that achieve a cessation of aggression and a complete withdrawal from the Gaza Strip."

-ABC News’ Will Gretsky