Former governor of Delta State, James Ibori, has challenged his 2012 conviction for fraud at the British Court of Appeal, The Sun reports.

His media assistant, Tony Eluemunor, said his principal’s lawyer made this known at the Southwark London Court, United Kingdom, on Friday, March 17, 2017, during an ongoing asset seizure trial.

The confiscation trial, presided over by David Tomlinson, is to determine if Ibori’s assets should be seized.

“In light of the information, the court indefinitely adjourned the ongoing proceedings on the confiscation case,” Eluemunor said.

The UK’s National Crime Agency has investigated alleged evidence of police corruption and claims that the crown prosecution service withheld key evidence in Ibori’s money laundering trial.

Ibori’s former lawyer and co-accused, Bhadresh Gohil, had alerted the authorities of police corruption at the heart of his and Ibori’s investigation and prosecution.

He also claimed that he was unlawfully detained for 33 days between November 20 and December 22, 2015. Gohil, in July 2016, received £20,000 from the crown prosecution service as compensation for deprivation of his rights. He was jailed for 10 years in 2010 for helping Ibori to launder money.

Ibori was jailed for 13 years, in 2012, after he pleaded guilty to laundering money in the United Kingdom.

He returned to Nigeria on February 4, six years after he was arrested in Dubai by Interpol operatives.