How did the police know you were near a crime scene? Google told them

How did the police know you were near a crime scene? Google told them

Knowing the Silicon Valley giant held a trove of consumer mobile phone location data, investigators got a Hennepin County judge to sign a "reverse location" search warrant ordering Google to identify the locations of cellphones that had been near the crime scene in Eden Prairie, and near two food markets the victims owned in Minneapolis and St. Paul.