71 killed in Israeli attack on Iran prison, official says

Iran's Ayatollah Khamenei delivered a televised address on Thursday morning, just days after the United States targeted three Iranian nuclear facilities in a 30-hour bombing campaign, with the leader saying Iran has "delivered a harsh blow to America."

Saturday's operation, named "Operation Midnight Hammer," marked the U.S. military's largest-ever deployment of B-2 stealth bombers and first use of 30,000-pound bunker-buster bombs in combat, Pentagon officials said. The 30-hour precision strike targeted three Iranian nuclear facilities, making it the longest B-2 mission since 2001, according to officials.

Ayatollah Khamenei struck a defiant tone on Thursday as he congratulated Iran for "its victory over the American regime."

"The Islamic Republic also triumphed here and delivered a harsh blow to America. My second congratulations go to our dear Iran for its victory over the American regime," Khamenei said. "The US entered direct war because it felt that if it didn't, the Zionist regime would be completely destroyed. Yet, it gained nothing from this war. Here too, the Islamic Republic emerged victorious and delivered a harsh slap to America's face."

"A nation of around 90 million stood united, with one voice, shoulder to shoulder, supporting the armed forces," he continued. "The Iranian people demonstrated their exceptional character and showed that, when needed, a single voice will rise from this nation."

In a lengthy social media post Wednesday evening, President Donald Trump expressed his support for Israeli Prime Minister Benjamin Netanyahu, who is currently on trial in his country for bribery, fraud and breach of trust in multiple cases.

Coming to the prime minister's defense, Trump called him a "warrior" and used similar terminology that he used in his legal battles, calling Netanyahu's corruption trial a "witch hunt" and a "horror show."

The post comes as Trump celebrates victory in the ceasefire between Israel and Iran.

"Netanyahu's trial should be CANCELLED, IMMEDIATELY, or a Pardon given to a Great Hero, who has done so much for the State," Trump wrote in the Truth Social post. "Perhaps there is no one that I know who could have worked in better harmony with the President of the United States, ME, than Bibi Netanyahu. It was the United States of America that saved Israel, and now it is going to be the United States of America that saves Bibi Netanyahu."

-ABC News' Kelsey Walsh

Iran’s nuclear program "has been severely damaged," according to the CIA, which said it has "new intelligence from an historically reliable and accurate source."

"Several key Iranian nuclear facilities were destroyed and would have to be rebuilt over the course of years," the agency said.

The CIA said it is continuing to collect additional information.

-ABC News' Cindy Smith

The Defense Intelligence Agency on Wednesday has released a statement describing its Iran bomb strike assessment as "a preliminary, low confidence assessment – not a final conclusion – and will continue to be refined as additional intelligence becomes available."

The statement adds that "we have still not been able to review the actual physical sites themselves, which will give us the best indication."

DIA is also working with the FBI and other agencies to investigate the leak of the assessment, it said.

-ABC News' Luis Martinez and Anne Flaherty