Well.. from the comments I see here even the Israelis themselves presume that Israel was behind the attacks.. now as it comes to the arms smuggling, etc. there is no eivdence for that and even then trhe act is not justified. You can simply go to another country and kill their civilians... in the old world, that amounted to a declaration of war...
Australian police arrest 5 over shooting 'linked to terrorism' (Reuters)
from the article: What is Sudan hiding about the air strike it blamed on Israel?