Iranian drones struck a major oil depot in Oman, another strike against a country long viewed as a friend to Tehran and a crucial mediator in regional relations.

Oman had been spared from Iranian attacks after two drone strikes that hit the port town of Duqm on March 1 and March 3. The semi-truce was broken on Wednesday, when Iran launched at least two waves of drone strikes against Oman. The first wave, targeting the port town of Duqm, was unsuccessful, with one drone intercepted and the other crashing into the sea. The second attack, targeting the port city of Salalah, was successful, with videos showing at least three fuel tanks on fire. Salalah is located in Oman’s far south, the furthest away from Iran.