RAMALLAH, West Bank—Secretary of State Antony Blinken worked to assure Palestinian leaders that the U.S. is committed to helping Palestinian civilians, as the death toll of children from the conflict passed 4,000, according to local health authorities.  

Blinken’s unannounced Sunday visit to the West Bank, to meet Palestinian Authority President Mahmoud Abbas, came hours after an Israeli airstrike hit a refugee camp in Gaza, killing at least 38 people according to the Hamas-controlled health authority. Israeli officials didn’t immediately comment on the explosion at the Al Maghazi refugee camp.