District Attorney Richard Brown said the office conducted a thorough probe and presented all the evidence to the grand jury.

WSJ: No grand jury indictment in NY police shooting

The Metropolitan Police previously have said their initial phone-hacking probe was full and thorough.

WSJ: Phone-Hacking Scandal Builds Momentum in U.K.

But the police watchdog probe would be "thorough and wide-ranging", it added.

BBC: Hillsborough: 1,444 police names passed to IPCC