Israel's arrest of almost 30 mostly Jewish citizens who allegedly spied for Iran in nine covert cells has caused alarm in the country and points to Tehran's biggest effort in decades to infiltrate its arch foe,

In the months before Iranian ballistic missiles struck the Nevatim Airbase in October, Iran dispatched spies to film and photograph the site in southern Israel, according to Israeli authorities.

In a major development, Israeli authorities have arrested almost 30 individuals, mostly Jewish citizens, accused of spying for Iran. These arrests are part of one of the most significant espionage operations Israel has faced in decades.

Israel's arrest of almost 30 mostly Jewish citizens who allegedly spied for Iran in nine covert cells has caused alarm in the country and points to Tehran's biggest effort in decades to infiltrate its arch foe,