WASHINGTON — The Chinese spy balloon floating over the continental United States generated deep concern on Capitol Hill in part because it came on the heels of a classified report to Congress that outlined incidents of American adversaries potentially using advanced technology to spy on the country.
The classified report to Congress last month discussed at least two incidents of a rival power conducting aerial surveillance with what appeared to be unknown cutting-edge technology, according to U.S. officials. While the report did not attribute the incidents to any country, two American officials familiar with the research said the surveillance probably was conducted by China.
