The Pentagon said it is investigating 171 unexplained UFO sightings in a report released just a month before four unidentified objects were shot down over North America.
The government's efforts to document the mysterious objects, known in official terms as “unidentified aerial phenomena”(UAPs), has led to hundreds of incidents being looked into, senior military leaders have said.
This comes as an object floating through US airspace was shot down on Sunday with officials refusing to rule out an alien origin.
