Tens of thousands protest arrests in controversial Ergenekon in Turkey

Authorities say at least 30,000 protesters gathered in downtown Ankara on Sunday waving Turkish flags and carrying posters of late leader Mustafa Kemal Ataturk, chanting: "We are soldiers of Ataturk!"

The Ergenekon case, launched in 2007, was filed against more than 200 people on the charge of forming an illegal organization to provoke a series of events that would pave the way for a military coup.

The controversial case, however, has divided Turkey, as many believe it has turned into a witch hunt targeting government critics

The protesters will later march to the mausoleum of Ataturk, who established the secular republic following the collapse of the Ottoman Empire.