A recent report has revealed that Iranian hackers were behind the 2013 attack on a dam near New York. The BBC reports that although it did no damage, it revealed a lot about how the flood control system worked and other significant information.
Bowman Avenue dam in Rye, New York, is just one of many targets, however. It is believed that in the last decade alone, hackers have accessed a dozen power networks. Usually the intent is to gather information rather than shut down the networks or change the way they work, although naturally there is concern about what might be done in the future.
The same Iranian hacking group is believed to be behind a separate attack on three US financial firms.