Members of the Rouvikonas (Rubicon) group broke the entry box and windows of the offices with a sledgehammer and threw red paint before they fled.
![Abdel Fattah al-Sissi has been the president of Egypt since 2014 [2CC]](data:image/svg+xml;charset=utf8,%3Csvg%20xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg'%20width%3D'100'%20height%3D'100'%20data-ring-placeholder%3D'1'%3E%3C%2Fsvg%3E "Abdel Fattah al-Sissi has been the president of Egypt since 2014 [2CC]")
Greece's parliament on Thursday launched a probe into claims that nearly a dozen senior politicians received bribes from or helped promote Novartis during their term in office.
Among the 10 senior politicians reportedly named by protected witnesses in a mostly US-based investigation are conservative ex-PM Antonis Samaras, EU migration commissioner Dimitris Avramopoulos and central banker Yannis Stournaras.
They all deny wrong-doing.
The Swiss drug-maker is suspected of having bribed decision-makers and doctors between 2006 and 2015 to build a commanding position in the Greek health market, as well as secure inflated prices for its products.
Rouvikonas claimed the attack in a post on an anti-establishment website saying it came in support of those implicated because they face allegations from anonymous witnesses.
Novartis issued a statement Sunday asking Greek authorities to denounce the Rouvikonas attack and protect the lives of its employees.
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