Jakarta - The Corruption Eradication Commission (KPK) questioned former tax official Gayus Tambunan for more than five hours on Wednesday in an effort to uncover the alleged tax mafia.

"They asked me about anything I know about the way tax officials carry out their job," Gayus said after the questioning.

Gayus had been convicted of corruption and sentenced to seven years in jail. During his trial he had unveiled the involvement of law enforcement and tax officials in his case.

When asked about the tax mafia issue he told reporters to ask about it to his lawyer and investigators.

His lawyer, Hotma Sitompoel, meanwhile confirmed that his client had been questioned about general things connecting to the working system of the tax officials.

"(The questioning) has not yet touched the case. It is still general. What they do when they meet tax payers or how complaints are handled or how tax court is carried out. That`s all," he said.

He declined when asked about the names of tax officials Gayus told about to the investigators.

He said what was clear is that his client`s presence at the KPK was like what his former lawyer Adnan Buyung Nasution said is to give information that the KPK needed.