United States Marines opened fire on demonstrators during the storming of the Karachi consulate over the weekend, two US officials said on Monday — a rare use of force at a diplomatic post that could sharply escalate tensions in the country amid widespread protests over the assassination of Iran’s leader. On Sunday, 11 people were killed when protesters breached the compound’s outer wall after Iranian Supreme Leader Ayatollah Ali Khamenei was assassinated in strikes on Iran. Citing initial infor...