When a Wells Fargo branch was robbed in Aurora, Colorado, police took it seriously, stopping every car at a nearby intersection and holding them at gunpoint while they attempted to locate the pilfered cash. The mass detention of 29 people lasted over two hours and led to two lawsuits; one by fourteen people who were detained and another by the bank robber, who was caught in the stop.
If that's not bizarre enough, consider how the robbery itself. Recently fired violinist and music teacher Christian Paetsch road to the bank on a stolen bicycle, donned a beekeeper's hat and held up the bank while blasting an air horn. When he left, he took $26,000 in cash and a hidden tracking beacon.
He'd returned to his car by the time police placed the street on lockdown. In an appeal from his conviction, he argued that the mass detention was an unreasonable search and seizure.