Over a week after arresting mining baron G. Janardhana Reddy for illegal mining, the Central Bureau of Investigation will on Friday interrogate two of his brothers G. Karunakara and G. Somashekara, agency sources said late Wednesday.

"Karunakara Reddy and Somashekara Reddy have been summoned to appear before CBI in Hyderabad on Sep 16," the sources said.