BALTIMORE, MD - AUGUST 16:  Baltimore Mayor Catherine Pugh talks about the late night removal of four confederate statues in the city, on August 16, 2017 in Baltimore, Maryland. The City of Baltimore removed four statues celebrating confederate heroes from city parks overnight, following the weekend's violence in Charlottesville, Virginia.  (Photo by Mark Wilson/Getty Images)
Mark Wilson/Getty Images
BALTIMORE, MD - AUGUST 16: Baltimore Mayor Catherine Pugh talks about the late night removal of four confederate statues in the city, on August 16, 2017 in Baltimore, Maryland. The City of Baltimore removed four statues celebrating confederate heroes from city parks overnight, following the weekend's violence in Charlottesville, Virginia. (Photo by Mark Wilson/Getty Images)
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(CNN) —  

Federal authorities on Thursday executed search warrants at the home and several locations tied to Baltimore Mayor Catherine Pugh as part of an investigation into whether she improperly profited from a no-bid book deal steered to a Maryland medical system while she served on its board.

The FBI and criminal investigators from the Internal Revenue Service executed court-authorized search warrants at the home of the Democratic mayor, a second residence she owns, city hall, a nonprofit the mayor has worked with and the downtown office of her attorney, FBI spokesman Dave Fitz said.

The home of Gary Brown, a former Pugh aide, is also being searched.

The FBI said they have made no arrests at this time in connection with the raids. Pugh, who has taken a leave of absence from her role as mayor, was home when authorities arrived at her house shortly before 7 a.m. ET, a law enforcement official said.

Republican Gov. Larry Hogan’s office confirmed that the searches are tied to the book scandal. He was briefed on the raids by a law enforcement adviser, his office said, and Hogan called for Pugh to resign.

“Now more than ever, Baltimore City needs strong and responsible leadership,” Hogan said in a statement. “Mayor Pugh has lost the public trust. She is clearly not fit to lead. For the good of the city, Mayor Pugh must resign.”

Steven Silverman, Pugh’s attorney, disputed the characterization that Thursday’s searches were a “raid” and said federal agents served a “limited subpoena for original financial records” that the law firm had for representing her in the “Healthy Holly matter.”

“The agents were polite and courteous, and the process was conducted in an expeditious and professional manner,” Silverman said in a statement.

Spokesmen for Pugh and Jack Young, the acting mayor of Baltimore, had no comment on Thursday’s developments. The state prosecutor’s office – which Hogan said he asked to investigate Pugh – said it couldn’t confirm or deny any investigation.

While Pugh was a board member of the University of Maryland Medical System, the group spent $500,000 to fund the purchase of some 100,000 children’s books authored by Pugh from her company Healthy Holly LLC, a spokesman for the medical system has confirmed.

Pugh apologized in March for having “done something to upset the people.” Baltimore’s city council has called for Pugh to resign.

The UMMS spokesman, Michael Schwartzberg, has said UMMS never had possession of any Healthy Holly books, nor did it distribute books. Book distribution was managed by Healthy Holly LLC.

In a statement to CNN on Thursday, UMMS said it has received a grand jury witness subpoena stemming from the investigation of Pugh.

“The University of Maryland Medical System has received a grand jury witness subpoena today from the U.S. Attorney’s Office for the District of Maryland seeking documents and information from UMMS in order to conduct their investigation of Mayor Pugh,” the statement reads. “We are fully cooperating with the investigative process.”

Pugh recently returned $100,000 to the medical system and canceled her book deal. She has also resigned from the hospital’s board, according to Schwartzberg.

Pugh also received about $114,000 from Kaiser Permanente for some 20,000 books from 2015 to 2018, according to the health care provider. Kaiser Permanente said it delivered the books to back-to-school fairs, elementary schools, communities of faith and early childhood education and care centers.

Additionally, Associated Black Charities, a public foundation that works to encourage healthier and more prosperous communities, said it spent approximately $80,000 between 2011 and 2016 to buy some 10,000 copies of Pugh’s books – a project the organization learned about while she was still a state senator.

This story has been updated.

CNN’s Carma Hassan and Devan Cole contributed to this report.