An explosion has struck a Hong Kong-flagged container ship traveling north through the Red Sea, sparking a major fire that forced its crew to abandon the vessel.

Yemen’s Iran-backed Houthi movement has released the crew of a cargo ship more than a year after its fighters hijacked the vessel in the Red Sea, as part of its campaign of attacks in support of Hamas in its war against Israel.

U.S. ships are returning to the Red Sea following promises from Yemen’s Houthi rebels to abstain from attacks on American and British vessels. The pledge, which comes after more than a year of shipping traffic disruption on a major international trade route,

Shipping companies expressed caution about using the shorter route between Asia and Europe that many ships have avoided for more than a year.

Yemen’s Houthi rebels have signaled they will limit their attacks in the Red Sea corridor to only Israeli-affiliated ships as a ceasefire in the Gaza Strip takes hold.

The world’s top three container shippers, MSC Mediterranean Shipping, A.P. Møller-Maersk (OTCPK:AMKBY) (OTCPK:AMKBF) and CMA CGM, have said in recent days they will not send vessels back to the Red Sea despite a pledge by Houthi militants in Yemen not to attack them as long as a ceasefire in Gaza holds.

Yemen’s Houthi rebels have released the crew of the Galaxy Leader, a vehicle carrier seized in November 2023 at the start of their attacks on shipping in the Red Sea corridor over the Israel-Hamas war.