Israel's military says it struck a "communications centre of the Iranian regime", but Iran calls the attack a "war crime".

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.

An Iranian state television reporter stopped a live broadcast when an explosion occurred an hour after Israel issued a warning to evacuate the area of Tehran where the TV studios are located.

Oman and Qatar were leading efforts to begin ceasefire talks, while mediators said Iran was open to resuming nuclear negotiations if Israel’s attacks stop.

"Israel is being assisted this way or that way by some Iranians," ex-Israeli National Security chief Giora Eiland told Newsweek.

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The death toll is rising as Israel and Iran traded missile strikes for a third straight day. The death toll grew Sunday as Israel and Iran exchanged missile attacks for a third consecutive day, with Israel warning that worse is to come.