VANCOUVER, British Columbia (AP) — Prime Minister Justin Trudeau says that on his order a U.S. fighter jet has shot down an “unidentified object” flying high over northern Canada. The shootdown came a day after U.S. planes took similar action over Alaska. Shortly before Trudeau’s announcement Saturday, the North American Aerospace Defense Command said it had detected an object flying at high altitude over Canada. It did not say when the object was first spotted or what it is. Hours later in the U.S., the Federal Aviation Administration and NORAD temporarily closed airspace in Montana while fighter aircraft investigated “a radar anomaly” and then reopened the airspace when the fighters did not identify any object.