'Very serious': Israel's blows against Iran expose infiltration

It remains a closely guarded secret how, and how deeply, Israel has infiltrated Iran's administration and security apparatus. But analysts say Israel's recent successes -- including assassinations, targeted strikes and secret operations -- would be impossible without information being leaked at a high level. The issue of the extent of Israel's reach inside the Islamic republic is particularly acute as tensions spiral between the two foes, with both sides openly attacking the other's territory for the first time.