Detention warrant was reportedly issued for 60-year-old construction worker, H. S., after police failed to locate his two children, wanted for their alleged use of ByLock mobile application.

According to Aktif Haber online news portal, H.S.’s son and daughter, both teachers by profession, along with their spouses were caught up in Turkey’s post-coup dragnet as they are accused by an Ankara prosecutor of having used ByLock, connecting to an Internet network registered on their father’s name. While police conducted a search on H.S.’s house, Ankara-based man is now wanted over Gulen links.

ByLock is a controversial mobile app that Turkish authorities claim to be the top communication tool among followers of the Gulen movement, which the government accuses of masterminding the July 15, 2016 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 violating the principle of individual criminal responsibility, let alone the question marks raised over the government narrative that the movement was involved in the coup attempt.