FBI, IRS raid state Sen. Carlos Uresti's San Antonio law office

The FBI raids the law office of state Sen. Carlos Uresti in San Antonio Thursday, Feb. 16, 2017. The FBI raids the law office of state Sen. Carlos Uresti in San Antonio Thursday, Feb. 16, 2017. Photo: Guillermo Contreras/San Antonio Express-News Photo: Guillermo Contreras/San Antonio Express-News Image 1 of / 26 Caption Close FBI, IRS raid state Sen. Carlos Uresti's San Antonio law office 1 / 26 Back to Gallery

FBI and IRS agents descended on the San Antonio law offices of state Sen. Carlos Uresti on Thursday morning, confiscating documents and other items in connection with the senator's involvement in a now-defunct San Antonio oil field services company accused of fraud, and other matters.

"I can confirm the FBI and IRS are lawfully present and conducting a lawful law enforcement activity," said FBI spokeswoman Michelle Lee. She said no arrests had been made.

Uresti was not at his law office when the raid occurred; he is in Austin, where the Texas Legislature is in session. The Senate is adjourned until 11 a.m. Tuesday, but staff said Uresti was at meetings in the capital city.

"Today, FBI agents are in my office, reviewing our documents as part of their broad investigation of the FourWinds matter," Uresti said in a prepared statement. "I have instructed my staff to fully cooperate with the federal investigators. I will help them in whatever way I can."

His son Carlos Uresti Jr. was seen at the site, sources said.

READ MORE: Everything we know about Sen. Uresti's connection to FourWinds

Video: FBI, IRS raid state Sen. Carlos Uresti's San Antonio law office

FourWinds Logistics, which traded frac sand, went into bankruptcy in 2015 and is accused of defrauding investors.

Investors have alleged their money was wasted by FourWinds CEO Stan Bates on personal expenses, expensive gifts, exotic car rentals and a wild lifestyle, the San Antonio Express-News reported in August.

Already, three FourWinds officials were charged in connection with a scheme to defraud investors and pleaded guilty to a single felony charge. They have yet to be sentenced.

FourWinds: Second former executive charged in alleged fraud tied to Sen. Uresti

Uresti had multiple roles with FourWinds. He provided legal services and served as outside general counsel for the company for four or five months at the end of 2014. He had a 1 percent ownership interest in the company, though he said the stock certificates were never transferred to him.

The senator also helped recruit investors.

One investor, Denise Cantu of Harlingen, was a former legal client who he helped win a personal-injury case following the 2010 death of two of her children. He suggested she go see Bates. Uresti later received a $27,000 commission on her $900,000 investment with FourWinds. Cantu lost most of her money.

This is a developing story and additional details will be added as more information is available.

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GContreras@express-news.net