The White House readout of a Biden-Trudeau call regarding a U.S. fighter jet shooting down an object in Canadian airspace, under Norad auspices.

Given the trajectory of previous airborne objects, good likelihood this flew through Canadian airspace before crossing border. US F15's now look set to take it down over Montana. Doesn't mean North American Aerospace Defense Command didn't detect earlier, just didn't interdict until now.

Montana object not a thing, after all. At least, not a thing that F15's could find.

To close the loop on this, North American Aerospace Defense Command launched F15's after a radar anomaly, but they found nothing.

UPDATE: The FBI has been called to help with the search and recovery efforts of the object shot down over the Yukon. The RCMP is asking people to stay away from the debris site, and if anyone recovers any debris, they're asked to call police.

Another air defence operation over Canada, this time near Tobermory, Ontario. Airspace closed. Could be something or, like Montana yesterday, a radar blip and nothing more. @cbcnews

What we know now: US Congressman says pilots have "decommissioned" object over Lake Huron. Response aircraft airborne now. Earlier, restricted airspace over Lake Michigan (just to the west) was reopened. Now, Canadian airspace restricted over portion of Lake Huron.

Now the work of trying to find the debris, if possible. There is an E3B airborne surveillance aircraft in the area. It would fine tune where the object was, where it landed, and control the various military aircraft which responded.

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