Ukraine has been rocked by political instability since February of this year, with the country's military forces having become embroiled in a conflict with pro-Russian separatists.
Shakhtar's stadium, the Donbass Arena, was damaged by two explosions on August 23 and the club have now revealed on their official website that on Wednesday their "office at 86a Artema St in Donetsk was occupied by armed men."
The loyalties of those involved was not confirmed, with the club merely adding that the "circumstances of the incident are being investigated."
The news comes just over a month after six Shakhtar players – Fred, Ismaily, Douglas Costa, Alex Teixeira, Dentinho and Facundo Ferreyra – refused to return to Ukraine because of the current conflict.
The reigning Ukrainian Premier League champions also recently revealed that they will not be able to host games at the Donbass Arena this season because for safety reasons and will instead base themselves in Lviv.