According to a Washington Post report, the Israeli intention behind the attack on Iran was to signal that Israel has the ability to attack its nuclear facilities.

Additionally, according to a former Mosaad senior official, the purpose of the attack was to signal to the Iranians that Israel is capable of not only hitting Iranian infrastructure (airports, oil fields, etc.), but also other infrastructures (electricity, water, traffic), and again- their nuclear facilities. 

These reports haven't been confirmed by Israeli officials. 

Photo: IDF.