US-based Citigroup and French bank BNP Paribas are caught up in the US criminal case against the chief financial officer of China’s Huawei Technologies, according to newly available documents.

The banks were named in documents released on Tuesday after a hearing in British Columbia Supreme Court where Huawei CFO Meng Wanzhou is fighting extradition to the United States on bank fraud charges.

The two are among at least four financial institutions that had banking relationships with Huawei when Meng and others allegedly misled them about its business dealings in Iran despite US sanctions.

Two others, HSBC Holdings and Standard Chartered, have been previously reported.

The banks are considered “victim” institutions in the 13-count indictment the United States brought against Meng and Huawei, which includes charges of bank and wire fraud, violating sanctions against Iran and obstructing justice.

Both she and Huawei have denied wrongdoing.

Representatives for the four banks did not immediately respond to emails from Reuters seeking comment. But Standard Chartered, Citigroup and BNP Paribas have previously declined to comment when asked by Reuters about their possible involvement in the Huawei case.

The court allowed the materials, including video of Meng’s arrest, to be made public in advance of a hearing scheduled to begin Sept. 23 in Vancouver.

Meng, the daughter of Huawei’s billionaire founder Ren Zhengfei, was arrested at Vancouver’s airport in December on a US warrant and her lawyers argue she was unlawfully detained. They claim Canadian authorities delayed her arrest to allow the border patrol to gather evidence for the US as part of a “covert criminal investigation”.

In the video, Meng can be seen moving through the Vancouver airport customs and immigration area, escorted by border agents, and being questioned.

In a transcript, Meng repeatedly asks why she was being detained and is told she can contact a lawyer, but not her family.

“My family members will be worried if they can’t find me,” she says.

Meng was searched and interrogated for hours in violation of her constitutional rights, her lawyers say. She spent more than a week in detention before being granted bail.

The United States placed Huawei on a trade blacklist in May that bans the sale of US parts and components to the company without special licenses, which it has not granted except to allow the repair and maintenance of existing products and networks.

Huawei is the world’s largest telecommunications equipment maker and a major smartphone provider.

The United States also says its smartphones and network equipment could be used by China to spy on Americans, allegations the company has repeatedly denied.

In one document released on Tuesday, the United States describes the evidence against Meng, including articles published by Reuters in 2012 and 2013 about a company in Iran called Skycom Tech that had tried to sell computer equipment by a U.S. company to a customer in Iran.

The reporting detailed links between Huawei and Skycom, including that Meng had served on Skycom’s board of directors between February 2008 and April 2009.

The articles were “concerning” to at least four financial institutions that banked for Huawei, according to the document, which was drafted by a US federal prosecutor in Brooklyn, New York, where the case was brought against Meng and Huawei.

US laws and regulations generally prohibited the banks from providing US dollar transactions tied to Iran through the United States.

Meng and others defrauded HSBC and other banks by misrepresenting Huawei’s relationship with Skycom, according to US prosecutors who claim Skycom’s operations in Iran were controlled by Huawei from at least 2007 until 2014.

US authorities claim Huawei used Skycom to obtain embargoed U.S. goods, technology and services in Iran, and to move money via the international banking system.

According to the newly available document about the evidence, witnesses for the prosecution of the US case will include executives from HSBC, Standard Chartered and Citigroup, and an FBI forensic accountant is expected to testify about documents showing BNP Paribas provided banking services for Huawei between at least 2013 and 2018.