Israel and Iran launched fresh attacks on each other overnight into Sunday, as U.S. President Donald Trump said the conflict could be easily ended while warning Tehran not to strike any U.S. targets.

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.

Explosions heard in Tehran after Netanyahu warns it will pay ‘heavy price’ for strikes - Explosions heard in Tel Aviv and Tehran on Sunday afternoon

The fighting, which began on Friday with a surprise Israeli attack on Iran, has been some of the fiercest and most prolonged in the decades-long enmity between Israel and Iran, raising fears of a wider war that could draw in the United States and other powers.

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.

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

Israel has launched a series of strikes against Iran, targeting the country’s nuclear program and other military infrastructure. Iran has launched its own strikes in retaliation.