Saudi Arabia's foreign minister on Monday denounced "aggressive statements" by Iran, after Tehran accused Saudi ally Bahrain of stoking Gulf tensions by making unfounded allegations against it.

"This is unacceptable to us," Foreign Minister Adel al-Jubeir said at a joint news conference with visiting EU foreign policy chief Federica Mogherini.

On Sunday, Iranian foreign ministry spokeswoman Marzieh Afkham accused Bahrain of making "unfounded allegations" aimed at creating "tension in the region", after the interior ministry in Manama said it had detained two men accused of trying to smuggle weapons from Iran.