Microsoft alerted the communications firm working with the campaign team of US presidential candidate Joe Biden of an attempt to hack into its systems by “state-sponsored” hackers, according to the exclusive report of Reuters.

Reuters report named “Fancy Bear,” the group said to be controlled by Russia’s military intelligence agency, as the ones behind the attempted attacks over the last two months. The group is also behind the previous hacking of 2016 Democratic presidential candidate Hillary Clinton, according to Microsoft

SKDK said “there has been no breach” as the network’s defenses have been tight and secure.

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Previously, the US intelligence agencies have warned of potential attacks by foreign actors leading to the US presidential elections in November.

Reuters said the campaign team of Biden has been told of the attempts and “assured” that hackers failed to access “non-campaign email accounts of individuals affiliated with the campaign.”

Reuters reported Dmitry Peskov, Kremlin spokesperson, responded the allegations as “nonsense.”