At least four vessels make U-turns after warnings from Yemeni rebels, as fresh threat emerges to Red Sea shipping

Houthi rebels in Yemen have warned they will impose a “maritime embargo” against Saudi Arabia as the Iranian-backed militant group threatens to reignite its years-long conflict with the kingdom.

The Houthi warning for the Red Sea, coming on top of Iran’s threat to shipping on the other side of the Arabian peninsular in the Gulf, could affect the substantial Saudi oil exports that have so far ...