Operatives from Iran and its Lebanese ally Hezbollah are working inside Yemen to support Huthi insurgents' attacks on international shipping, a US official said Tuesday.Tim Lenderking, the US special envoy for Yemen, told a Senate subcommittee that Iran's clerical state was "equipping and facilitating" the Huthi attacks, which have triggered retaliatory US and British strikes on Yemen."Credible public reports suggest a significant number of Iranian and Lebanese Hezbollah operatives are supporting Huthi attacks from inside Yemen," Lenderking said.