Wilcox, WY Train Robbery - The Wild West - Famous Robberies - One Minute History

A group of outlaws robs a Union Pacific train, stealing $50,000. In response, a specially outfitted train is dispatched to investigate, and a $3,000 reward is offered for each of the six bandits. A posse of over 100 people, including law enforcement and the Pinkertons, forms within 24 hours to hunt the criminals. The stolen banknotes are spent across the West, and evidence suggests Butch Cassidy was the mastermind, though the culprits remain unidentified.

What was the response of law enforcement to the robbery within 24 hours?

Which famous outlaw is suggested to be the mastermind behind the robbery?