Rights groups say at least five people were detained and 25 homes and offices searched in the third successive day of raids.
The private company has come under fire for hacking the popular mobile application to help governments snoop on political dissidents and activists.
Nabeel Rajab, a key figure of 2011 pro-democracy protests in Bahrain, was convicted over tweets alleging the torture of prisoners in his country and criticism of Saudi Arabia's air strikes in Yemen
Local Amnesty director Idil Eser is one of 10 activists, including a German and a Swedish national, who have been accused of aiding terror organisations.
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