A hacking group linked to the Russian government has been attempting to breach the U.S. power grid, Wired reports.

The hackers have been tracked by security experts from the non-profit group the Electric Information Sharing and Analysis Center (E-ISAC) and security firm Dragos.

They warn that the hacking group has been probing the grid for weaknesses, searching for ways that they could access the systems.

Even though there are no signs that the group has succeeded in accessing the power grid, the attacks still have experts worried.

Triton attacked critical infrastructure like industrial control systems which are often used in power plants, and could have been used to cause massive destruction through tampering with power plant controls.

In 2016, a state-sponsored Russian group attempted to hack American utilities via the compromised email account of a contractor, as reported by the Wall Street Journal.

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