The 's rejection of 's claim that a balloon detected floating over nuclear sites in the United States is a 'civilian' airship raises further questions about its surveillance capabilities.
Analysts predict the balloon is about the size of 'three buses' and could be fitted with high-tech equipment including cameras, sensors and radar.
Use of balloons to conduct spy missions dates back to the Cold War but modern-day systems can take advantage of the latest developments in surveillance technology.
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