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.

Iranian state media claimed the attack was carried out by Houthi militants in Yemen with a guided missile against a Saudi navy vessel.

The media cites a source as saying the vessel had 176 sailors and officers, as well as a combat helicopter, on board at the time of the attack.

The US Navy told Business Insider that it was aware of reports of the Saudi ship being hit but could not yet confirm or deny the event.

Yemen’s Houthi militants have received support from Iran. In October, the same Houthi militants successfully struck a United Arab Emirates vessel with an anti-ship cruise missile in the waters off Yemen’s western coast, where Iranian media claims this strike took place.