Its appearance in US airspace has provoked a diplomatic crisis and led US Secretary of State Antony Blinken to cancel a trip to China - the first such high level US-China meeting there in years. The US military used a fighter jet to shoot the balloon down over the Atlantic Ocean over the weekend.China on Thursday said it was not aware of any wider fleet of surveillance balloons. The claim is "probably part of the information and public opinion warfare the US has waged on China", Chinese Foreign Ministry spokesperson Mao Ning said.