ROME — The main suspect in the Vatican’s corruption investigation into a London real estate venture was taken into custody Tuesday in London after he appeared for his first extradition hearing, his lawyers said.

The British judge determined businessman Gianluigi Torzi was a flight risk and ordered him detained. A statement from Torzi’s lawyers said they would argue he is not a flight risk at a new audience expected in the next 48 hours.

British authorities were acting on an arrest warrant issued last month by a Rome judge accusing Torzi of false billing, tax evasion and money laundering. Torzi has denied the allegations.

In addition, Vatican prosecutors have accused Torzi of extorting 15 million euros ($17.8 million) from the Holy See to turn over ownership of a luxury London building in which the Vatican’s secretariat of state was a majority shareholder.

Neither Torzi nor anyone else under investigation has been indicted in the 2-year-old Vatican probe.

Torzi denies wrongdoing. Contracts show top Holy See officials signed off on Torzi’s involvement in the deal, and even Pope Francis knew about it and had met with Torzi.