ANKARA, Turkey — Turkey has reportedly arrested two retired generals as part of an investigation into an alleged plot to topple the Islamic-rooted government.

The state-run Anatolia news agency reports today that Hursit Tolon and Sener Eruygur were among 21 people rounded up and questioned earlier in the week in a probe into an alleged coup plot by secularists.

Turkish authorities arrested the head of the capital's business chamber late Saturday as part of the same investigation.

The probe into the alleged pro-secular and nationalist network called “Ergenekon” began last year and dozens, including some of the government's fiercest critics, have been detained so far.

No indictments have been issued and no trial date has been set.

Details of the alleged plot are sketchy but some newspapers close to the government have said the suspects were plotting a series of events — such as mass demonstrations and violent clashes with police — that would lay the groundwork for an army takeover.