Hyderabad: Leading advocate PV Krishnaiah on Friday filed a petition in the Hyderabad High Court seeking CBI probe into all the developments related to cash-for-vote case. In his petition, Krishnaiah said that the arrest of TDP MLA A Revanth Reddy, allegations of phone tapping, defections in different parties and other developments should be probed through CBI. He also sought High Court's direction to the Centre to issue clear guidelines on the law and order situation in Hyderabad.