U.S. says 'not clear' if Iran exerting control over rebels in Yemen

WASHINGTON (Reuters) - It is "not clear" to the Obama administration whether Iran is exerting control over Houthi rebels in Yemen, White House spokesman Josh Earnest said on Friday. The Prime Minister of Yemen, Abd-Rabbu Mansour Hadi, resigned on Thursday over pressure from the rebels. (Reporting By Julia Edwards; Editing by Doina Chiacu)