Israel pounded Gaza overnight, killing dozens of Palestinians, a day after launching a fresh ground campaign as part of its renewed assault on the territory that shattered the two-month-old ceasefire with Hamas.

At least 59 people died in the strikes, Gazan officials said, adding to the hundreds killed since Tuesday when Israel resumed bombing the strip.

Israel blames the new fighting on Hamas for refusing to accept revised ceasefire terms. Hamas, in turn, has accused Prime Minister Benjamin Netanyahu of unilaterally upending the truce and putting hostages “at risk of an unknown fate.”

As well as bringing brief calm to Gaza and allowing in vital aid, the ceasefire also saw dozens of hostages swapped for hundreds of Palestinian prisoners.

The Israeli military said Wednesday that it had launched “targeted ground activities” in Gaza, partially recapturing a key area in the territory.

The Israel Defense Forces (IDF) said its troops aimed to “expand the security zone and to create a partial buffer between northern and southern Gaza.”

“As part of the ground activities, the troops expanded their control further to the center of the Netzarim Corridor,” the military said, referring to a key Israeli-demarcated strip of land that splits Gaza in half, dividing the central Gaza City and northern Gaza from the southern parts of the strip that borders Egypt.

Hamas called the latest offensive a “new and dangerous breach” of the ceasefire agreement. The militant group, in a statement Wednesday, said it remained committed to the ceasefire agreement it signed with Israel in January.

Israel’s war in Gaza has killed nearly 50,000 Palestinians, mostly women and children, according to the enclave’s health ministry, and as the war resumes, the toll is mounting