"As per information made available by CBI, a total number of 1,126 cases are at different stages of investigation as on June 30," Minister of State for Personnel, Public Grievances and Pensions Jitendra Singh said in a written reply in Rajya Sabha.
He said investigation is conducted by CBI as per provisions of Code of Criminal Procedure and as per instructions contained in the crime manual.
"In some cases, the investigation takes time because of the complicated nature of cases requiring scrutiny of voluminous documents and examination of large number of witnesses, conducting extensive enquiries and in obtaining opinion of experts to establish the allegations.
"No time frame can be assigned for completion of investigation as it depends on nature of the individual case," Singh said.
He said the CBI has disposed off from investigation 1,173 cases in 2010, 992 in 2011, 1,019 in 2012, 1,070 in 2013, 1,094 in 2014 and 361 between January and June this year.