Hacker group Anonymous has released purported audio tapes of the St. Louis Police Department's dispatch from Saturday, the day of Michael Brown's fatal shooting in Ferguson, Missouri. 

The relevant audio starts around 9:30 in the YouTube video. 

The dispatcher tells a St. Louis officer that "Ferguson is asking for assistance with crowd control" and later asks the officer to let her know what's going on as soon as he arrives.

That suggests Ferguson may not have reported Brown's shooting to St. Louis police before asking for back-up. Ferguson also deployed their K-9 unit, according to the dispatcher.