What do we know about spy balloons?

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China has urged "cool-headed" handling of a dispute over a giant Chinese balloon heading for the eastern US. US Secretary of State Antony Blinken earlier called off a visit to Beijing, saying the "surveillance" balloon's presence was "an irresponsible act". Later the US reported a second Chinese balloon floating over Latin America. China expressed regret over the balloon over the US, saying it was a weather airship that had been blown astray. It was last spotted over Missouri. It is expected to reach America's east coast near the Carolinas this weekend. The US has decided not to shoot down the high-altitude airship due to the danger of falling debris. The incident comes amid fraying tensions between the US and China. To find out more about how these balloons work and what they do, Newshour's Julian Marshall has been speaking to John M Powell, president of JP Aerospace in California. He began by asking him whether he thinks this is a weather or a spy balloon. (Photo shows: A surveillance balloon by the US-Mexico border is pictured on March 27, 2018 in the Rio Grande Valley Sector. Credit: Getty Images)