71 killed in Israeli attack on Iran prison, official says

Iranian officials gave advanced noticed of the retaliatory attacks -- a message that was delivered through Qatar to the United States, multiple sources confirmed to ABC News.

It's unclear when the message was delivered to the U.S., but it was sent with enough time for the U.S. to anticipate the attack, sources said.

President Donald Trump thanked Iran on Truth Social, writing, "I want to thank Iran for giving us early notice, which made it possible for no lives to be lost, and nobody to be injured."

-ABC News’ Rachel Scott and Shannon Kingston

No Americans were hurt and "hardly any damage was done" by Iran’s "very weak" and "expected" missile attack on the United States’ Al Udeid Air Base in Qatar on Monday, President Donald Trump wrote on Truth Social, adding that the attack was "very effectively countered."

Trump also said no Qataris were killed or hurt.

Trump said Iran fired 14 missiles. He said "13 were knocked down, and 1 was ‘set free,’ because it was headed in a nonthreatening direction." A U.S. official confirmed that 13 of the 14 Iranian missiles were intercepted by the U.S. and Qatar, and the 14th did not end up in Qatar. The official also confirmed that little damage was done.

Trump said Iran has "gotten it all out of their ‘system,’ and there will, hopefully, be no further HATE."

"I want to thank Iran for giving us early notice, which made it possible for no lives to be lost, and nobody to be injured," Trump continued. "Perhaps Iran can now proceed to Peace and Harmony in the Region, and I will enthusiastically encourage Israel to do the same."

In a separate post, Trump wrote, "CONGRATULATIONS WORLD, IT’S TIME FOR PEACE!"

After attacking a U.S. base in Qatar on Monday, Ayatollah Ali Khamenei, the supreme leader of Iran, posted on social media saying they will not surrender.

The post was accompanied with a picture of a burning American flag.

"We have not violated anyone’s rights, nor will we ever accept anyone’s violation; this is the logic of the Iranian nation," Khamenei said.

-ABC News' Will Gretsky

The State Department has issued a new worldwide caution alert prompted by the conflict between Israel and Iran.

"The conflict between Israel and Iran has resulted in disruptions to travel and periodic closure of airspace across the Middle East. There is the potential for demonstrations against U.S. citizens and interests abroad. The Department of State advises U.S. citizens worldwide to exercise increased caution," the alert reads.

Earlier this month, the State Department issued a regional alert related to the conflict, advising Americans in North Africa and the Middle East to exercise increased caution.

-ABC News' Shannon Kingston