Israel unleashed airstrikes across Iran for a third day and threatened even greater force as some Iranian missiles evaded Israeli air defenses to strike buildings in the heart of the country.

Sirens sounded in Israel as Iran launched dozens of ballistic missiles in retaliation for Israel's strikes on its nuclear facilities.

From a bomb shelter at Tel Aviv, our correspondent reports of the wail of sirens signaling incoming ballistic missiles the length of Israel Sunday evening.

Explosions have been seen over Tel Aviv and Jerusalem as the country faces yet another barrage of missiles from Iran. It comes after explosions were reported in central Tehran, as attacks continue between Iran and Israel.

Missiles and projectiles were seen in the skies over Jerusalem and Tel Aviv early on Sunday as Tehran unleashed a fresh attack on Israel which in turn launched an expanded assault on Iran.

Israeli citizens were ordered to head to bomb shelters on Friday night amid retaliatory missile strikes from Iran.