Indictments against Iranians accused of cyberattacks have been unsealed.

FOX's Tonya J. Powers has details:

All seven of the hackers indicted worked for Iranian computer companies that did work on behalf of the Iranian government.

The cyberattacks on a small dam outside New York City and on dozens of banks were carried out between 2011 and 2013.

U.S. attorney for the southern district of New York Preet Bharara called the hacks a "frightening new frontier":

(Bharara) "And although no actual harm resulted from that infiltration the potential havoc that such a hack of American infrastructure could wreak is scary to think about."

Those charged are not in American custody, but officials say the goal is to put cybercriminals on notice that they can't act with impunity.

Tonya J. Powers, FOX News.