Iran has threatened Saudi Arabia and the United Arab Emirates (UAE) with retaliation after 27 members of the country's elite revolutionary guard forces were killed in a suicide bombing on Wednesday.
The head of the revolutionary guards, Mohammad Ali Jafari, claimed, without evidence, that the US and Israel had ordered Saudi Arabia and the UAE to carry out the attack.
"We definitely will retaliate," the general said, in comments reported by state media.
Mr Jafari was speaking at one of two funeral ceremonies held on Friday for the attack's victims.
The Jaish al-Adl Sunni militant group claimed responsibility for the bombing, which wounded 12 people.