Iran has arrested dozens of people on suspicion of spying as fears grow in the Islamic Republic over the extent of its infiltration by Israel’s Mossad intelligence service.

Israel and Iran have begun a new round of attacks, as the conflict between the two heavily armed rivals enters its fourth day.

In a statement aired on state television, the Guards said they "struck the military intelligence centre of the Zionist regime's army, Aman, and the Zionist regime's terrorist operations planning centre, the Mossad, in Tel Aviv", adding it was "currently on fire".

Israel’s historic strike on Iran revealed years of Mossad activity inside the country, including hidden weapons, drones and assassinations of nuclear officials.

Israel struck Iran's state-run television station during a live broadcast, forcing a reporter to run off camera following an explosion.

Israel warned hundreds of thousands of people to evacuate the middle of Iran's capital as Israel’s air campaign on Tehran appeared to broaden on the fourth day of an intensifying conflict. An Iranian television anchor fled her studio during a live broadcast as bombs fell on the headquarters of the country's state-run TV station.

Iran’s Islamic Revolutionary Guard Corps announced that it had directly targeted two high-level intelligence facilities inside Israel.

TEHRAN: Iranian authorities have executed an individual convicted of spying for Israel’s Mossad intelligence agency, according to state media reports on Monday, as tensions between the two countries