Why did Netanyahu end the Gaza ceasefire?
The wave of Israeli strikes that killed hundreds of Palestinians across the Gaza Strip early Tuesday was the culmination of Prime Minister Benjamin Netanyahus efforts to get out of the ceasefire with Hamas that he agreed to in January.
Since the start of the war, Netanyahu has faced dueling, possibly incompatible pressures: Families of the hostages want him to cut a deal with Hamas to free them, while his far-right coalition partners want to continue the war with the aim of annihilating the militant group.
On Tuesday, he appeared to cast his lot with the latter and U.S. President Donald Trumps administration has backed Netanyahus decision to unilaterally walk away from the ceasefire it took credit for brokering.

Both Israel and the United States blame the renewed hostilities on Hamas refusal to release more hostages before negotiations on ending the war proceed which was not part of the ceasefire agreement. Israel has accused Hamas of preparing for new attacks, without providing evidence. The militant group has denied those allegations.
https://apnews.com/article/israel-palestinians-hamas-war-ceasefire-hostages-netanyahu-ff48f081b069e484955a72bc68261364