High altitude whodunit: Concern mounting over objects in North American airspace

Pressure is intensifying to explain the multiple high-altitude objects shot out of the sky over Canada and the U.S., which have put these countries on high alert. Mackenzie Gray looks at the efforts to recover the debris of these objects, how officials are reacting, and what the White House is saying about the possibility of aliens.

• U.S. military recovers key sensors from downed Chinese surveillance balloon