But he warned, “This war will take time. It will be difficult.”“All the places that Hamas hides in, operates in, we will turn them into ruins,” he added. “Get out of there now,” he told Gaza residents, who have no way to leave the tiny, overcrowded Mediterranean territory of 2 million people.After nightfall, Israeli airstrikes in Gaza intensified, flattening several residential buildings in giant explosions, including a 14-story tower that held dozens of apartments as well as Hamas offices in central Gaza City. Israeli forces fired a warning just before, and there were no reports of casualties.