Inside the violent threat against the Beatles' only Colorado concert

The Beatles only performed in Colorado once, at Red Rocks Amphitheatre in Morrison. Denver police and the FBI investigated a threat to attack the band with a grenade that was received prior to the concert.

Red Rocks Park and Amphitheatre - #TBT to when The Beatles played #RedRocksCO. If you missed this in the summer of 1964, get ready to go back to the beginning, with the

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Inside the violent threat against the Beatles' only Colorado concert