GAZA CITY, Gaza Strip (AP) Israeli airstrikes on Gaza City flattened three buildings and killed at least 42 people Sunday, Palestinian medics said, in the deadliest single attack in the latest round of violence. Despite the toll and international efforts to broker a cease-fire, Israeli Prime Minister Benjamin Netanyahu signaled the fourth war with Gazas Hamas rulers would rage on.

In a televised address, Netanyahu said the attacks were continuing at full-force and will take time. Israel wants to levy a heavy price on the Hamas militant group, he said, flanked by his defense minister and political rival, Benny Gantz, in a show of unity.

Hamas also pressed on, launching rockets from civilian areas in Gaza toward civilian areas in Israel. One slammed into a synagogue in the southern city of Ashkelon hours before evening services for the Jewish holiday of Shavuot, Israeli emergency services said. No injuries were reported.

In the Israeli air assault early Sunday, families were buried under piles of cement rubble and twisted rebar. A yellow canary lay crushed on the ground. Shards of glass and debris covered streets blocks away from the major downtown thoroughfare where the three buildings were hit over the course of five minutes around 1 a.m.