A Huddersfield businessman has been arrested in the United States in connection with an alleged $189m dollar fraud.
Mohammad Safdar Gohir was detained in Las Vegas where he had flown to watch the Amir Khan flight.
Details of his identity were released only after he appeared in a Las Vegas court to apply for bail.
His application was rejected.
Gohir, who is known as Uncle Saff, has been a long-time sponsor of the top boxer.
He was filmed in an interview with Khan in Las Vegas.
Gohir applied at the Nevada District Court for bail but the application was refused by presiding Judge James C Mahan.
Gohir is awaiting extradition to Germany.
He lives in Norwood Road, Birkby, and has business premises in Lindley.
The 56-year-old was held by US police on behalf of German authorities in Las Vegas as they are investigating a suspected tax fraud worth 136 million euros ($189 million).
A German prosecutor said the man was under investigation for participating in a scheme to evade taxes through trading European Union carbon emission certificates using a business based in Dubai.
German authorities had issued an international warrant for his arrest and he is is now being held in custody in Las Vegas awaiting extradition, the Frankfurt prosecutor said in a statement.
“The accused had flown from Dubai to a boxing event in Las Vegas where he was sponsoring one of the boxers in a fight,” the prosecutor said. “He was arrested on the sidelines of the event.”
A carbon credit is a certificate or permit which represents the right to emit one tonne of carbon dioxide (CO2) and they can be traded for money.
But the Financial Conduct Authority said many investors had told them they were not able to sell or trade the carbon credits they have bought. None of these investors reported making a profit.
The arrest is part of a global probe that has also affected Deutsche Bank, where prosecutors are investigating 25 staff, including co-Chief Executive Juergen Fitschen and finance chief Stefan Krause, on suspicion of tax evasion, money laundering and obstruction of justice.
At least 14 people have been jailed in three countries so far for their involvement in carbon trading VAT fraud.
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