text: Israel Presses Offensive in Northern Gaza BEIT LAHIYA, Gaza Strip - Israeli tanks and bulldozers pulled back from this Palestinian town Thursday, after tearing up roads, flattening strawberry greenhouses and knocking down walls of dozens of houses in what residents said was the most devastating raid in four years of fighting.    The two-day foray into Beit Lahiya was part of a major Israeli military offensive in the northern Gaza Strip, now in its third week...