An Iranian hactivist group has claimed responsibility for a cyberattack that gave it access to the control system for a dam in the suburbs of New York — and intrusion that one official said may be "just the tip of the iceberg."

The group, SOBH Cyber Jihad, sent a message through another Iran-linked hacker outfit, Parastoo, promising that it would release the technical information that proves it was behind the 2013 breach, according to Flashpoint Intelligence.

The hackers claimed they kept quiet about the attack for two years because of a "state-level" warning not to go public with it "for the greater good."
http://www.nbcnews.com/news/us-news/...rk-dam-n484611