Iran flew Islamic Revolutionary Guard Corps (IRGC) commanders, military advisers and missile- and drone-related equipment into Yemen this month, according to four sources, in a move that suggests Tehran is seeking to strengthen the ability of its Houthi allies to threaten Red Sea shipping.

Four sources familiar with the matter, including two Iranian sources, Yemen¡¯s information minister and a regional security analyst, said Iran transferred the IRGC personnel and military-related equipment ?on a flight from Tehran to Yemen on July 13, a development that has not been previously reported.

The two Iranian sources said that between ?10 and ?21 IRGC personnel, including senior commanders, were on the Mahan Air flight.