A large force of Israeli tanks, armored vehicles and troops pushed into northern Gaza in an overnight raid, which continued Wednesday, killing at least three Palestinians, the Associated Press quoted Palestinian sources as saying. About 110 Israeli vehicles _ including tanks, armored personnel carriers and bulldozers _ swarmed throughout a swath of northern Gaza. In the town of Beit Lahiya, troops sealed off roads as bulldozers destroyed some houses, witnesses said. The raid came a day after Palestinian fighters fired three rockets into southern Israel, causing no injuries or damage.