The trouble broke out inside the main counting room in Detroit late on the morning of Nov. 4.

It was the day after Election Day, and until then the process of tabulating votes from the city’s various counting boards had gone smoothly inside the TCF Center, the cavernous convention hall that plays host to the North American International Auto Show.

As batches of ballots came in by van, workers methodically inspected and registered them at 134 separate tables, each monitored by voting rights observers and so-called election challengers from each party.