Law enforcement and industry have tried to keep the public from learning about the surveillance devices, which can collect data from cellphones in bulk.

these looters are 40-50 cars deep riding around the city. #Chicago #ChicagoScanner

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Gas Team arrived at Erie and Michigan, be careful

CHICAGO: WALTON STREET, SHOTS FIRED

Shots fired in Chicago https://t.co/DWk5VPATnH

#CHICAGOScanner #ChicagoRiots YO TWO OFFICERS ARE SHOOTING THE HEAD UP WITH EACH OTHER. WTF. https://t.co/gmUuOkWTeH

SWAT is on its way to nordstrom to clear the looters

5 more arrested for looting in the #Target A Foot pursuit also took place, leading to another in custody

CHICAGO: widespread rioting and looting tonight https://t.co/wBFgOVhh7s