"The investigation has been intensified and is at an advanced stage," an official of the wing told PTI, adding that they were confident that the accused would soon be brought to book.
Meanwhile, the producer Anwar Rasheed appeared before the investigating officials here and his statements were recorded.
Besides Rasheed, who had filed an online complaint with police on the wide circulation of copies of the movie on the internet, assistant editor and some other technicians connected with the film also appeared, the official said.