Israel committed to a daily 10-hour pause in military operations for "humanitarian purposes" after aid agencies warned of spreading starvation in Gaza.

U.S. President Donald Trump said on Sunday Israel would have to make a decision on next steps in Gaza, adding that he did not know what would happen after moves by Israel to pull out of ceasefire and hostage-release negotiations with the Hamas militant group.

The Israeli military has intercepted a Gaza-bound aid ship, detaining 21 international activists and journalists and seizing all cargo, including baby formula, food, and medicine, according to the Freedom Flotilla Coalition.

Médecins Sans Frontières (MSF) says the air drops "might help" but notes that the "most vulnerable" in Gaza would still struggle to access essential supplies.

"I will make the solemn announcement at the United Nations General Assembly in September," President Macron said.

Palestinian health officials and the local ambulance service say Israeli airstrikes and gunfire have killed at least 42 people in Gaza.

"The humanitarian catastrophe that we are witnessing in Gaza must end now," a joint statement from the three countries reads.

Twenty-one months into Israel’s war in Gaza, the enclave is gripped by escalating scenes of death and hunger, with some killed while trying to reach aid, others dying of starvation and growing condemnation of Israel’s conduct even among many of its closest allies.