Iran's Islamic Revolutionary Guard Corps navy said two oil tankers exploded and caught fire after hitting naval mines while trying to cross the southern part of the Strait of Hormuz via an unauthorized route.
It was also reported that the vessels turned off their navigation and automatic identification systems and tried to pass secretly.
After the explosions, two other tankers attempting a similar passage heeded the warnings of the Navy's traffic control center in the strait and turned back towards the Gulf, the statement said.
It is the second such announcement in two days, after Iranian forces said on Friday that two tankers, one of them a supertanker, caught fire after hitting mines, and warned shipowners to coordinate with its traffic control center. Iran tightened its control over the Strait on February 28, after the US and "Israel" launched their aggression against Iran.