Questions remain over what the three objects shot down over North America this weekend were.
BBC News, Washington
"It's not uncommon as well for the US to illegally enter the airspace of other countries," spokesman Wang Wenbin told reporters. Since that first incident, American fighter jets have shot down three more high-altitude objects in as many days - over Alaska, Canada's Yukon territory, and Michigan - and the administration has been under pressure to identify the objects.
Efforts are currently under way to collect debris from where the objects fell, but Mr Kirby noted the objects in Alaska and Canada were in remote terrain and would be difficult to find in winter weather conditions, while the object in Michigan, he said, lay in the deep waters of Lake Huron.
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