Saudi TV showed footage of police raiding a property as well as images of explosives seized in the raid. The attacks were reportedly supposed to be revenge strikes for the US killing of Iranian general Qassem Soleimani in January in a drone strike in Baghdad.
The reports did not say when the attack was meant to have taken place, but said a case was being prepared against 18 accused, of which nine are now in Iran. Iranian state media also acknowledged the reports of the Bahraini arrests, but no official commented on them.
Last week, Bahrain normalised relations with Israel alongside the United Arab Emirates, drawing criticism from Iran.