Iran's support for Yemen's Houthi movement is "quite significant and it's lethal," U.S. special envoy on Yemen Tim Lenderking said on Wednesday, as he called a battle for Yemen's gas-rich Marib region the single biggest threat to peace efforts. Lenderking told U.S. lawmakers that Iran supports the Houthis in several ways, including through training, providing lethal support and helping them "fine tune" their drone and missile programs. "Unfortunately all of this is working to very strong effects as we see more and more attacks on the Kingdom of Saudi Arabia - and potentially other countries - more accuracy and more lethality. So this is a great concern to us," Lenderking told a hearing of the U.S. House of Representatives Foreign Affairs Committee. "Iran's support to the Houthis is quite significant, and it's lethal," Lenderking said. Source: Reuters