Bahrain intercepted and destroyed several Iranian aerial attacks, it said on Sunday, while Tehran said it had struck a US military base in the Gulf kingdom amid uncertainty over a deal to end the US-Israeli war on Iran.
The first such interceptions by Bahraini air defences since September followed two warnings of potential threats, urging residents to seek shelter.
Iran's Islamic Revolutionary Guard Corps said it had attacked a US military base in Bahrain in retaliation for "hostile US actions", Iran's Fars news agency reported.
The Bahraini military said its air defences had intercepted several Iranian aerial attacks before they reached their targets, accusing Tehran of continuing its "systematic hostile approach" towards the kingdom.
The Revolutionary Guards said they had launched six drones targeting US air defence radar at the Al-Rifaa helicopter base in Bahrain, Iranian state-run Press TV reported. There was no immediate confirmation from US or Bahraini authorities.