DEIR AL-BALAH, Gaza Strip (AP) — Israel said Wednesday its troops retook part of a corridor that bisects Gaza, and its defense minister warned that attacks would increase “with an intensity that you have not known” until Hamas frees dozens of hostages and gives up control of the territory.

The relative calm of a ceasefire between Israel and Hamas has come to an abrupt end with Israel launching dozens of attacks on targets across the Gaza Strip.

The death toll rose to more than 400, Gazan authorities said, marking one of the deadliest days since the war began. The attacks came after a breakdown in talks to release hostages.