Kremlin-based hackers reportedly targeted Ireland's power grid in another cyberattack on UK's critical infrastructure.

Security experts reportedly believe that the Russian hackers intended to compromise control systems and targeted senior engineers of Ireland's Electricity Supply Board (ESB) with phishing emails.

Although there is no evidence to suggest that Irish energy networks were disrupted, security experts reportedly believe hackers stole data, including passwords, and may have gained access to internal networks.

They also said that Ireland, which is home to the European headquarters of major American tech giants such as Facebook, Apple and others, is being used as a testing ground by Russian hackers.

The Times reported that it is believed the hackers who attempted to infiltrate the Irish power grid have ties to Russia's intelligence agency GRU.

The Russian hacker group Fancy Bear, which is widely believed to be responsible for the cyberattacks targeting US democratic parties during the 2016 presidential elections, has also been previously linked to the GRU.

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