Photo: Photo by Smith Collection/Gado via Getty ImagesChina-linked spies are still lurking inside U.S. telecommunications networks roughly six months after American officials started investigating the intrusions, senior officials told reporters Tuesday. Why it matters: This is the first time U.S. officials have confirmed reports that Salt Typhoon hackers still have access to critical infrastructure — and they're proving difficult to kick out. Officials added that they don't yet know the full sco...