Iran’s navy and Revolutionary Guards said that fires had broken out on a total of three oil tankers that struck mines in the Strait of Hormuz, where Tehran has restricted navigation, AFP reports.

Since war erupted with the United States in February, Tehran has insisted that vessels obtain its authorisation to cross the strait and has attacked ships that do not comply.

“A short while ago, two oil tankers that had switched off their radar and positioning systems and were secretly attempting to transit the Strait of Hormuz through an unauthorised route exploded and caught fire after striking a naval mine,” the Guards’ navy said in a statement.

A separate statement from Iran’s conventional navy said another tanker “navigating through the unsafe and prohibited zone east of the Strait of Hormuz with its tracking and identification systems switched off, caught fire and was forced to stop after striking a naval mine”.