Explosions and smoke plumes have been reported from several countries around the Persian Gulf.
In images from Bahrain, large black clouds of smoke are seen rising into the sky from an area where the US has a naval base, which Iran says it has dealt "heavy blows" to.
"The Fifth Fleet's service center has been subjected to a missile attack," Bahraini authorities said in a statement, but gave no other details.
Saudi Arabia, the United Arab Emirates, Qatar, Jordan and Kuwait - all of which host US bases - say they have also been attacked and that they have shot down missiles in their airspace.
Saudi condemnation
Iran's armed forces consider the locations from which the American and Zionist operations were carried out legitimate targets, Iranian Foreign Minister Abbas Araghchi said on Iranian television, according to AFP.
Saudi Arabia condemns Iranian attacks on the country's capital, Riyadh.
"They came despite the fact that the Iranian authorities knew that the Kingdom had confirmed that it would not allow its airspace and territory to be used to attack Iran," the Saudi Foreign Ministry wrote on X.
According to the AFP news agency, eyewitnesses have said they heard explosions and saw smoke coming from the artificial islands of Palm Jumeirah, one of Dubai's most famous landmarks.
Black smoke reportedly rose from a hotel, and several ambulances then rushed to the scene.
Several explosions have also been heard in Qatar's capital, Doha. The country's Defense Ministry says it has shot down several missiles heading towards al-Udeid Air Base, the largest US military base in the region.
Drone wave against Israel
Al-Udeid Air Base became a target for Iran this summer, in retaliation for US attacks on Iran's nuclear facilities.
Qatar has sent out a warning text message to residents to stay indoors and away from military bases.
Explosions have also been heard near the US consulate in Erbil in northern Iraq.
In Israel, the military says its air defense system was activated to deal with several rounds of Iranian missile attacks on Saturday. Explosions were heard in several places.
Residents across Israel received messages on their phones this morning about an "extremely serious" threat and were urged to stay close to their shelters.
