A fragile ceasefire in Gaza is buckling under new attacks, with Israel launching fresh airstrikes and closing crossings.
At least 51 Palestinians, including children, have been killed, and humanitarian aid has been cut off.
The escalation came after a "blatant violation of the ceasefire agreement" by Hamas, according to the Israel Defense Forces.
Mediation efforts are scrambling to preserve the fragile truce.
Author's summary: Gaza ceasefire collapses under new attacks.