Netanyahu's statement on Friday came after accepting the task of forming a new government in the wake of the tight elections.
"Iran is seeking to obtain a nuclear weapon and constitutes the gravest threat to our existence since the war of independence," Netanyahu said at a ceremony at President Shimon Peres's official residence.
"The terrorist forces of Iran threaten us from the north," he said in reference to Lebanon and Syria, where Israel says Tehran supplies arms to Hizbullah and Hamas.
The sources told An Nahar that the rocket attack could also possibly be a "message" to Damascus, which at the time of the assault was receiving U.S Senator John Kerry as the new U.S administration reviews its policies towards such states in the Middle East.
