Chicago - streets under attacks

In the last weeks, Chicago population was under attack. Flash Mob attacks, according to some stories, with the purpose of theft.
That is what i had read in the Chicago Tribune.

And i remembered about street children of 1970 from a south american country, so called "piranhas", who attack in gang, in day time and leaves the victims without nothing.

Their reason for theft was survival, childrens with age from 8 to 10 years old, without family, alone on the streets.

Sure, is not the case of the recent attacks, but there are some things in common.

As a CSI, Criminal Minds & other series fan, it was surprise that, not even one video from public and private cameras, had emerged in the police investigations.
Anyway, in Chicago Tribune such facts do not appear.

A story to be followed this summer.