Emine Sennur Sen, the sister-in-law of Turkey’s major coup suspect Adil Oksuz was put under pre-trial arrest on Monday.

Sen is accused of having used ByLock, a controversial mobile app that Turkish authorities claim to be the top communication tool among followers of the Gulen movement.

A Sakarya court ruled on her arrest as part of an investigation into the movement, which the government pinned the blame on for the July 15 coup attempt.

Turkish government has so far detained 120,000 people and arrested some 50,000 over the faintest –true or alleged– links to the Gülen movement.

Critics often blast the government for a massive purge it is carrying out that violates the principle of individual criminal responsibility. Meanwhile, question marks are yet to simmer down also over accusations against the actual suspect Adil Öksüz as he was released after being detained immediately after the coup attempt.