Bahrain and Kuwait came under attack from missiles and drones on Thursday, their respective militaries said, as the Iranian military said it had launched attacks targeting U.S. bases in both countries.

Iran's Islamic Revolution Guards Corps said the aerial attacks were a retaliation for U.S. strikes against Iran, according to a statement published by Iranian state media outlets.

The military in Bahrain said that "Iran is persisting in its systematic hostile approach through heinous attacks involving missiles and drones targeting civilians in the Kingdom of Bahrain."

The country’s air defense systems destroyed "a number" of Iranian aerial attacks, the Bahrain Defence Force said in a social media post.

Kuwait earlier on Thursday said its air defense systems were "confronting hostile missile and drone attacks," but stopped short of identifying where those attacks were coming from.

"The General Staff of the Army notes that if explosion sounds are heard, they are the result of air defense systems intercepting the hostile attacks," the Kuwait Army said on social media.

U.S. forces have completed an additional round of strikes against Iran, striking roughly 90 military targets, U.S. Central Command said in an update late Wednesday.

CENTCOM said the targets included air defense systems, coastal surveillance assets, missile and drone storage sites, naval capabilities and military logistics infrastructure along Iran’s coastline.

The strikes "further degrade Iran's ability to attack commercial shipping and innocent civilian mariners in the Strait of Hormuz."

The night before, CENTCOM said U.S. forces hit approximately 80 Iranian military targets.

In a social media post, lead Iranian negotiator Mohammad Bagher Ghalibaf, said the Strait of Hormuz would only open with "Iranian arrangements."

"America still hasn’t learned that bullying and breaking promises are no longer cost-free," Ghalibaf said in the post, originally in Persian. " Let me put it plainly: if you strike, you’ll get hit. Don’t flail around pointlessly, or you’ll sink even deeper: the Strait of Hormuz will only open with 'Iranian arrangements,' not American threats."

President Donald Trump emphasized that today's additional strikes on Iran were conducted as "retribution" after Iran attacked three commercial vessels in the Strait of Hormuz.

"This is in retribution for yesterday's bombing of ships by Iran," he said in a new social media post.

Trump issued another stark warning to Iran, saying, "If it happens again, it will get much worse!"

Trump's post included an image purportedly showing explosions in Iran that had been posted on a different social media account.

That image appears to be from a June incident in Tehran and was likely altered using AI. ABC News has reached out to the White House for comment on the image.

-ABC News' Emily Chang