The US is tracking a suspected Chinese surveillance balloon that has been spotted flying over sensitive sites in recent days.
Defence officials said they were confident the "high-altitude surveillance balloon" belonged to China.
The military decided against shooting it down in case debris falls.
China warned against speculation and "hype" until the facts are verified.
Canada said on Friday that it was monitoring "a potential second incident" involving a surveillance balloon, but did not say which country could be behind it.
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