Singh said there has been an allegation that the Gujarat Police had carried out the fake encounter and investigation into it has been going on.
"There has also been allegation that some IB officials have done something wrong along with the Gujarat Police. If CBI has the evidence, they should be given the opportunity to prove them," he told reporters here.
The Congress leader was responding to a question on CBI's decision to summon the senior IB officer in the Ishrat Jahan fake encounter case.
CBI had issued the notices to the officer under the provisions of the Code of Criminal Procedure as previous examination of the officer was not satisfactory and replies given by him, the agency said, appeared diversionary.
