The world’s top three container operators said they fear instability in Gaza and broader regional tensions mean continued danger.

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 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.

The ship was drifting and ablaze some 225 kilometers off the coast of Hodeida, a port city in Yemen held by the country's Houthi rebels

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,