In what is clearly an act of war, Iranian-backed Houthi rebels conducted a suicide attack against a Saudi frigate in the Red Sea, off the coast of Yemen. It is thought the intended target was a US Navy warship in the area.

Two Saudi sailors were killed and three were wounded. At first the ship was thought to have been struck by a missile, defense officials told Fox News. But based on new analysis of a video showing the attack, American intelligence officials now believe this was, in fact, a suicide bomber whose small boat rammed the side of the Saudi vessel.

In the audio heard on the video, a voice narrating the attack shouts in Arabic, “Allahu akbar [God is great], death to America, death to Israel, a curse on the Jews and victory for Islam.”

U.S. defense analysts believe those behind the attack either thought the bomber was striking an American warship or that this was a “dress rehearsal” similar to the attack on the USS Cole, according to one official.