Israel resisted US calls for a pause in fighting and pressed its siege of Gaza City Saturday, with deadly strikes hitting an ambulance convoy and a school-turned-refugee shelter, AFP reports.

As Israeli Prime Minister Benjamin Netanyahu rebuffed pressure from visiting US Secretary of State Antony Blinken to enact a temporary humanitarian truce, the nearly month-old war in Gaza raged unabated.

At the Osama bin Zaid Boys School north of Gaza City, AFP saw the aftermath of what Gaza authorities said was tank shelling that killed 20 people.

Ambulance teams rushed into the debris-littered building to aid the injured and remove the dead. Stunned onlookers wept and wandered the scene with hands clasped above the head in horror and disbelief.

A long row of clothes and washing still hung from windows on the building’s first storey, evidence that this school had become a temporary home for some of the hundreds of thousands of Gazans displaced by the escalation.