GAZA/AMMAN, Nov 4 (Reuters) – Arab leaders publicly pressed U.S. Secretary of State Antony Blinken on Saturday to secure an immediate ceasefire in Gaza, hours after Palestinians said an Israeli air strike killed at least 15 people in a U.N.-run school being used as a shelter.

In a rare open display of disagreement, the top U.S. diplomat pushed back as he stood next to his Jordanian and Egyptian counterparts at a press conference, saying a ceasefire would only let Hamas militants regroup.

World and regional powers have failed to reach any consensus on how to deal with the escalating conflict in the four weeks since fighters from Hamas, which runs the Gaza Strip, burst over the border, killing 1,400 people and taking more than 240 others hostage.

Israel has since struck Gaza from the air, imposed a siege and launched a ground assault, stirring global alarm at humanitarian conditions in the enclave, Gaza health officials said on Saturday, killing more than 9,488 Palestinians.