'High-altitude object' entered U.S. airspace before being detected, FOX News reports …
White House gives update on takedowns of unidentified objects …
U.S. shoots down "high-altitude" object over Alaska …
High-altitude object shot down over northern Canada, Montana airspace temporarily closed …
White House: No indication of aliens, can't rule out surveillance from unidentified objects…
China accuses U.S. of flying surveillance balloons over their airspace …
New concerns after more objects shot down over U.S. …
