New Delhi, July 28 (ANI): Chairman of the Joint Parliamentary Committee (JPC) probing the 2G spectrum allocation scam, P. C. Chacko on Wednesday said that he was doubtful over meeting the August deadline of submitting the final report. While addressing mediapersons in New Delhi after attending the 12th meeting of the JPC, Chacko said the committee was unsure over the timely submission of the report. He said the committee is willing to work extra hours to wrap up the report on time. He further informed that the scale of investigation now cover a span of ten years starting from 1998 and all those who held crucial posts in the related ministries would be called for interrogation.