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

In a new post on his social media platform Sunday morning, President Donald Trump warned Iran not to escalate its attacks, following U.S. strikes against the country.

"Iran just stated that they are going to hit very hard today, harder than they have ever hit before," Trump wrote in the post. "THEY BETTER NOT DO THAT, HOWEVER, BECAUSE IF THEY DO, WE WILL HIT THEM WITH A FORCE THAT HAS NEVER BEEN SEEN BEFORE!"

The Iranian Revolutionary Guard Corps took responsibility for targeting 27 US bases in the Middle East region in a statement broadcast by Iranian state media Sunday morning.

Sirens were sounding in Bahrain at about 8 a.m. local time, Bahraini state TV confirmed.

In addition to the bases, the IRGC statement said it was targeting the large defense industrial complex in Tel Aviv.

The following three officials will act collectively as a temporary leadership council to govern Iran, Iranian state media reported.

The three individuals that will form the council are the Iranian President Masoud Pezeshkian, the Iranian Judiciary Chief Gholamhossein Mohseni Ejei, and a jurist from the Guardian Council, Iranian state media said.

A fire continues to burn at Erbil international airport in the Kurdistan region of Iraq after an explosion at daybreak. The Iranian-backed group Islamic Resistance in Iraq has now claimed responsibility for the strike.

What exactly is on fire remains unclear, but it is burning in an area that is comprises a number of military base buildings.

This base has been the target of repeated missile and drone attacks in the past.

-ABC News' Bader Katy and Paul P. Murphy