A number of container ships are anchored in the Red Sea and others have turned off tracking systems as traders adjust routes and prices in response to maritime attacks by Yemen's Iran-aligned Houthis on the world's main East-West trade route. Attacks in recent days on ships in the major Red Sea shipping route have raised the spectre of another bout of disruption to international commerce following the upheaval of the COVID pandemic, and prompted a U.S.-led international force to patrol waters near Yemen.