The United States military is tracking a suspected Chinese surveillance balloon over the country and has not shot it down due to the danger of injuring people on the ground.
A senior US defence official, speaking on the condition of anonymity, said that there was a "very high confidence" it is a Chinese high-altitude balloon and it was flying over sensitive sites to collect information.
One of the locations it was spotted was in Montana, which is home to one of the nation's three nuclear missile silo fields at Malmstrom Air Force Base.
