A Greek-flagged oil tanker traveling through the Red Sea came under repeated attack Wednesday, leaving the vessel “not under command” and drifting ablaze after an assault suspected to have been carried out by Yemen’s Houthi rebels, the British military said.

The attack, the most serious in the Red Sea in weeks, comes during a monthslong campaign by Houthis targeting ships over the Israel-Hamas war in the Gaza Strip that has disrupted a trade route through which $1 trillion in cargo typically passes each year.