U.N. soldiers on Thursday inspect the site in Lebanon thought to be the source of rockets fired into Israel . NEW : Prime Minister Fouad Siniora calls attack a violation of U.N. resolution . NEW : Lebanese government , United Nations investigating , Fouad Siniora says . at least four Israel -based rockets strike northern Lebanon , authorities say . Lebanese military returns fire toward source of rocket attack .
NEW : Prime Minister Fouad Siniora calls attack a violation of U.N. resolution . NEW : Lebanese government , United Nations investigating , Fouad Siniora says . at least four Israel -based rockets strike northern Lebanon , authorities say . Lebanese military returns fire toward source of rocket attack .