I have reported on this issue a few times and here is some further information from the Counterterrorism blog on why Israel felt that it was necessary to strike the nuclear facility inside the Syrian border:
You can read the story here
Interestingly, while North Korea has been mentioned many times, the role of Iran has not been scrutinized.
I just wrote a piece for the Middle East Times on that topic.
Here is an excerpt:
Israel has been providing intelligence and satellite images to the U.S. about a secret Syrian nuclear program for several months, according to media reports. Discussions between Israel and the United States took place last summer regarding a possible strike. But when Israel found the matter so pressing that when they realized the U.S. was not ready to act, on September 6 they attacked a Syrian nuclear site. Hence the question: what is Syria really up to or more to the point what is Iran up to?
First, let's start with an underreported explosion that occurred in a Syrian military base outside Aleppo on July 26. Jane's Defense Weekly reported, citing Syrian defense sources, as saying the explosion took place during a test to fit a "Scud C" missile with a mustard-gas warhead. It quoted the sources as saying the explosion occurred when fuel caught fire in the missile production laboratory.
But there might be another explanation. Kuwait's Al Seyassah newspaper recently reported that a Shiite Lebanese religious cleric claimed the Iranians were allegedly supervising a chemical weapons manufacturing program and that tens of Iranian experts and engineers died as a result of that explosion. He also said Israelis attacked the base. He added that Western officials told him they received proof from Israel on the Syrian chemical weapons program. Even if Israel's involvement is not proven, what remains sure is that it must be very happy that a chemical weapons facility in Syria has been partly destroyed.