In a sworn affidavit, Vanara alleged that Bongo offered the bribe on instructions of Eskom’s management team and board members.
He was appointed state security minister by former president Jacob Zuma a few weeks after the alleged incident.
As part of his bail conditions, Bongo is not allowed travel overseas without informing the investigating officer and may not interfere with witnesses.
ANC chief whip Pemmy Majodina said: “Yesterday I had a chat with him, he informed me that he was summoned to appear before court. This is how I know the story. But I was surprised and shocked to hear that he was then arrested this morning.”
Parliamentary spokesperson Moloto Mothapo was not aware of the details of the arrest or charges "but we will monitor the developments and we will comment at the appropriate time".
This is a developing story.