
Kuwait's air defenses were in operation intercepting "hostile missile and drone attacks" early on Thursday morning, the country's military confirmed.
"The General Staff of the Army notes that any explosions heard are a result of air defense systems intercepting hostile attacks," read a post on social media without specifying the origin of the attacks.
Like Bahrain, Kuwait was also targeted by Iranian retaliatory strikes on Wednesday.
Alarm warnings in Bahrain and Qatar
Bahrain's Interior Ministry said on Thursday morning that air raid sirens were sounded in the kingdom's capital, Manama.
There was no specific reference as to the provenance of the threat, but the country had been targeted by Iran on Wednesday in response to an initial wave of US strikes on Iran on Tuesday night.
At the same time, the Reuters news agency reported that residents of neighboring Qatar had received an "elevated security threat warning" on their mobile phones, followed shortly after by an all clear message.
Both Qatar and Bahrain are home to significant US military installations
Trump: Strikes are 'retribution' for Iranian retaliation
US President Donald Trump has said the fresh wave of strikes on Iran on Wednesday night is "retribution for yesterday's bombing of ships by Iran" in the Strait of Hormuz.
Amid a series of short, uncommented videos in the last 30 minutes, presumably showing the latest missile strikes on Iran, Trump wrote in a social media post, "If it happens again, it will get much worse!"
Iran targeted three cargo ships in the Strait of Hormuz on Tuesday in attacks which appear to have prompted Trump to declare the fragile ceasefire over and resume strikes on Iran.
Earlier on Wednesday, Trump made a series of seemingly contradictory remarks on the scope of the war.
He said the back-and-forth fighting would not lead to "long-term" military action and that "nything that happens is going to happen very fast." However, he also suggested the US military might "just finish the job.".