Saudi Arabia confirmed a Houthi militant attack that killed two Saudi sailors on Monday.

“A Saudi frigate on patrol west of the port city of Hodeida was hit by a terrorist attack from three suicide boats belonging to the Houthi militias,” Saudi state media said, according to Reuters.

However, the Saudis and Iranian media disagree on whether a missile or bomb-laden boat carried out the attack.

Footage claiming to show the attack surfaced on Monday.