Agents from the FBI and the Iowa Department of Criminal Investigation joined the search on Saturday, authorities said.

CNN: STORY HIGHLIGHTS

Hacohen said that hacking is a criminal act against citizens and the Israeli authorities have begun a criminal investigation, including a computer forensic probe to search for electronic evidence in an attempt to locate the group.

CNN: Hackers attack two Israeli websites

In the past few months investigators have once more been at the gruesome task of exhuming bodies in their search for evidence needed to prepare prosecutions at the International Criminal Tribunal for the Former Yugoslavia in The Hague.

ECONOMIST: The Yugoslav war

Armed police are patrolling the affected estates and, under Section 60 of the Criminal Justice and Public order Act, can stop and search for weapons.

BBC: Armed officers in Marsh Farm, Luton

Criminal Investigation Division of the IRS has the power to issue a search warrant.

FORBES: Can The IRS Access Your Emails?

Drummon explained Google's process for handling requests, which involves notifying users of the requests when legally allowed, and requiring a search warrant for search query and private information from agencies conducting criminal investigations.

CNN: Heather Kelly,