Helium is used to pressurize tanks and help push fuel into the engines. Without proper helium flow, the rocket cannot safely fly. Because the upper stage is hard to reach at the launchpad, NASA rolled the stacked rocket back into the Vehicle Assembly Building, the sky-scraping hangar where it was originally put together.
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The Taliban government says they were "retaliatory operations" - a response after "Pakistani military elements carried out an incursion into Afghan territory, violated Afghan sovereignty, and caused the deaths of several civilians, including women and children".