The Department of Justice is expected to announce charges against up to five Iranians believed to be tied to the 2013 hacking of a New York dam, a law enforcement source told Fox News.

The DOJ is expected to make the announcement sometime in the coming days, according to the source. The individuals are believed to have connections within the Iranian government.

The hackers allegedly infiltrated the control system of the Bowman Ave Dam in Rye Brook, N.Y., which is about 20 miles outside New York City, The Wall Street Journal reported at the time. The breach raised fears of the vulnerabilities of the United States' infrastructure to foreign hackers. It also came at a time that the Iranians were on the offensive in attacking U.S. banks.  

It was believed at the time that the hackers never took control of the dam, but were able to probe the system, the report said.

The expected DOJ announcement was first reported by The Wall Street Journal.

In this case, the hackers were believed to have gained access to the dam through a cellular modem, the paper reported in 2015, citing an unclassified Homeland Security summary of the case that did not specifically name the dam. Two unnamed sources told the paper that the summary was referring to the relatively small, 20-foot-tall, concrete dam about 5 miles from Long Island sound. The dam is used for flood control in the area.

Initially, intelligence analysts feared the hackers were targeting another dam: The Arthur R. Bowman Dam in Oregon, a 245-foot-tall earthen structure that irrigates local agriculture and prevents flooding near the town of Prineville, approximately 150 miles southeast of Portland. That belief prompted investigators to notify the White House that Iran had escalted its cyberwar with the United States.

The source told Fox News that the upcoming charges are expected to come out of the U.S. Attorney's Office in the Southern District of New York. 

Fox News' Matthew Dean contributed to this report.