The attacks came just before dawn.<br/> <br />One of Gaza's tallest structures, a 13-storey apartment and office tower was destroyed, along with most of a 16-floor residential building.<br/> <br />The Israeli military says it attacked 15 sites, including some in buildings it says housed Hamas command and control centers.<br/> <br />At sun rise, residents returned to survey the damage. This man says the Israeli Defense Forces called his neighbor to warn him of strikes:<br/> <br />(SOUNDBITE) (Arabic) RESIDENT OF BUILDING KNOWN AS "ITALIAN", MOHAMMED LUBAD, SAYING:<br/> <br />"They told him that after the third one, no one should be around the area of the building, because they will strike the building. They said - do not count the strikes, and do not come back to the area."<br/> <br />The warnings appear to have prevented any fatalities, although at least 20 people were wounded in the attack on a building known as the Italian Complex.<br/> <br />Hamas is accusing Israel of an unprecedented act of revenge against civilian
