First on CNN: FBI searched Biden documents at University of Delaware, source reveals

Timeline of finding classified documents at Biden properties 4:59

(CNN) --

The FBI conducted two searches at the University of Delaware in connection with the investigation into classified documents found on President Joe Biden's property, a source familiar with the case told CNN.

The searches, which were not publicly reported, were made in recent weeks with the consent and cooperation of the president's legal team, the source said.

The library at the University of Delaware, Biden's alma mater, has an extensive collection of documents from the period in which the now president served in the Senate, according to his website.

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The researchers recovered material from two campuses of the university on two different dates.

The material did not appear to have any classified markings, according to the source, but they are now under review by the FBI.

Investigators examined two different batches of documents during the searches: an archive of materials from Biden's time in the US Senate, as well as documents Biden sent to the university in recent years.

Molly Levinson, a spokeswoman for the president's personal attorney, had no comment and referred questions to the Justice Department.

A White House spokesman did not respond to a request for comment.

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The Justice Department declined to comment.

The University of Delaware also did not respond to a request for comment.

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The more than 1,850 record boxes have not been open to the public since the collection arrived at the university in 2012, the website says.

The searches at the University of Delaware are the latest action by researchers to locate any previously unknown classified documents.

FBI agents have searched both Biden's homes in Wilmington and Rehoboth Beach, Delaware, as well as the Washington DC office of the Penn Biden Center.

The FBI found classified documents at Biden's home in Wilmington and also took some materials from there from his time in the Senate, CNN previously reported, as well as at the Penn Biden Center office.

-- Hannah Rabinowitz contributed to this reporting.

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