Sources say it started when two special ops officers from the 12th Precinct were operating a "push off" on Andover near Seven Mile. That is when two undercover officers pretend to be dope dealers, waiting for eager customers to approach, and then arrest potential buyers and seize their vehicles.
But this time, instead of customers, special ops officers from the 11th Precinct showed up. Not realizing they were fellow officers, they ordered the other undercover officers to the ground.
http://www.fox2detroit.com/news/loc...fight-each-other-in-undercover-op-gone-wrong?