As Iran retaliates, largest US military base in Middle East hit by ballistic missile, Qatar says

Iran's foreign minister, Abbas Araghchi, told his Omani counterpart on Sunday that Tehran welcomes "any serious efforts contributing to de-escalation and the restoration of stability," according to a social media post from the Oman News Agency.

The post said Omani Foreign Minister Badr bin Hamad Al Busaidii, who had been mediating the negotiations between the United States and Iran leading up to Saturday's joint U.S.-Israel military operation, spoke with Araghchi by phone.

Araghchi "conveyed the position of the Islamic Republic of Iran, which calls for peace, noting that the Israeli-US attack upon his country had exacerbated tension and alarm throughout the region, while affirming the Iranian side's openness to any serious efforts contributing to de-escalation and the restoration of stability," the post read.

The post further said al-Busaidii "affirms the Sultanate of Oman's continued advocacy for a ceasefire and a return to dialogue and negotiation to resolve the ongoing conflict through diplomatic means."

-ABC News' Somayeh Malekian

Iran's state-run Islamic Republic State TV announced Sunday that its broadcasting building was targeted in the joint U.S.-Israel attacks.

A state TV presenter said that an American-Israeli attack targeted the country's broadcasting building. The presenter added that state TV broadcasting continues as usual as technical teams assess the situation.

-ABC News' Somayeh Malekian

President Donald Trump claimed on Sunday that U.S. military forces "destroyed and sunk" nine Iranian naval ships and that Iran's naval headquarters had also sustained major damage since strikes against the country began on Saturday.

"I have just been informed that we have destroyed and sunk 9 Iranian Naval Ships, some of them relatively large and important," Trump said in a social media post. "We are going after the rest -- they will soon be floating at the bottom of the sea, also!"

The president said Iran's Naval Headquarters was also attacked, adding, "We largely destroyed their Naval Headquarters. Other than that, their Navy is doing very well!"

Earlier Sunday, U.S. Central Command said in an online post that "an Iranian Jamaran-class corvette was struck by U.S. forces during the start of Operation Epic Fury. The ship is currently sinking to the bottom of the Gulf of Oman at a Chah Bahar pier."

-ABC News' Nicholas Kerr and Cindy Smith

The CIA had been tracking Iran's Ayatollah Khamenei for months prior to Saturday's U.S.-Israeli attacks on Iran, a source familiar with the intelligence confirmed to ABC News.

When they learned there would be a meeting of top leaders on Saturday with the Supreme leader, the timing of the attack was moved, the source said, adding that the agency had high confidence in their analysis.

These details were first reported by The New York Times. Khamenei was killed in Saturday's attacks.

A second source told ABC News that Israel had been planning for months with its own intelligence to target Iranian leadership, according to a person familiar with the operation.

-ABC News' Cindy Smith and Anne Flaherty