KIRIYAT SHEMONA, Israel (AP) - At least 50 Hezbollah rockets have struck northern Israel so far today. At least five Israelis have been hurt as rockets rained down on half a dozen or more towns, including Karmiel and Kiryat Shemona. Air raid sirens sounded several times in Haifa, Israel's third-largest city. Some explosions could be heard, but there are no reports of any damage or injuries. Haifa was hit by a barrage of rockets yesterday.