The Israeli army said that 21 soldiers have been killed in the central Gaza Strip, marking the deadliest single incident for the troops in the war against Hamas militants which began on October 7. Army spokesman Daniel Hagari, speaking after a news blackout was lifted on Tuesday morning, said the soldiers were killed on Monday afternoon when two nearby buildings exploded and collapsed. Prime Minister Benjamin Netanyahu said on Tuesday that it had been “one of the most difficult days since the outbreak of war,” his office said. “I mourn the loss of our heroic fallen soldiers.” The war continues…