A technical Fault or human error caused the crash of a Moroccan warplane in Yemen, the Saudi-led coalition said on Tuesday, denying rebel fire was responsible. Yemen's Shiite Huthi rebels said on Monday that they shot down a coalition warplane at the weekend, shortly after Morocco reported one of its fighters missing on a sortie. Brigadier General Ahmed al-Assiri said the F-16 pilot, who remains missing, was part of a formation and other aircraft "did **t **tice any firing from the ground". Wreckage of the plane had been located in the Huthi-controlled Saada area of **rthern Yemen, Assiri said, appealing for the rebels to contact the Red Cross about the airman's fate.