DUBAI (Reuters) - A series of Iranian officials vowed on Friday to expand Tehran's missile capabilities, a challenge to the United States which has threatened to impose new sanctions even as the vast bulk of its measures against Iran are due to be lifted under a nuclear deal. "As long as the United States supports Israel we will expand our missile capabilities," the Revolutionary Guards' second-in-command, Brigadier General Hossein Salami, was quoted as saying by the Fars news agency. "We don't have enough space to store our missiles. All our depots and underground facilities are full," he said in Friday...