No one was injured, according to the Qatari Ministry of Defense.
President Donald Trump announced "major combat operations" against Iran on Saturday, with daytime strikes in the joint U.S.-Israel attack targeting military and government sites, officials said.
On Sunday, Iranian state television confirmed that Ayatollah Ali Khamenei was among those killed by airstrikes in Tehran on Saturday.
Iran is responding to the U.S.-Israeli operation with missile and drone attacks targeting Israel, regional U.S. bases and Gulf nations. American diplomatic facilities have also been attacked.
In Lebanon, Israel is intensifying its long-running strike campaign against the Iranian-aligned Hezbollah militia.
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Iranian state media confirmed the deaths of Rear Adm. Ali Shamkhani, the secretary of the Defense Council, and Maj. Gen. Mohammad Pakpour, the commander-in-chief of the Islamic Revolutionary Guards Corps, in strikes on Saturday.
ABC News' Somayeh Malekian and Ellie Kaufman
Iran's parliament speaker, Mohammad Bagher Qalibaf, said in a speech on Sunday morning that the U.S. and Israel had crossed a red line in launching their attacks on Iran, vowing strong retaliation.
In his speech, which was broadcast on Iranian state television, Qaribah also addressed Iranian protesters directly, acknowledging their legitimate concerns but adding that no one should side with Iran's enemies.
Qalibaf said that the heart of the Iranian nation was broken after the death of Ayatollah Ali Khamenei and pledged that the path he forged would continue.
ABC News' Somayeh Malekian and Ellie Kaufman
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.
