The Sendai District Court on Tuesday delayed its decision on whether an arrested former senior official of the Osaka High Public Prosecutor's Office should be allowed to testify as a witness in an ongoing case over the disclosure of investigative expenditure figures.

A group of citizens' ombudsmen in Sendai filed the lawsuit in an attempt to win the release of spending figures for investigations by the Sendai High Public Prosecutor's Office and Sendai District Public Prosecutor's Office.

On Monday, the group submitted to the Sendai District Court a deposition by the arrested former official, Tamaki Mitsui of the Osaka High Public Prosecutor's Office.

In the deposition, Mitsui reportedly disclosed how off-the-book funds were raised and how investigative funds were used unlawfully.