[BBC] US Attorney General Merrick Garland has appointed a special counsel to probe President Joe Biden's handling of classified documents.Joe Biden garage SCIF photo
Robert Hur, a former senior justice department official during the Trump presidency, will lead the investigation.
Classified files were recently found in Mr Biden's home and at an office he used after his term as vice-president.
The US justice department is also conducting a review.
Sources familiar with the case who spoke with CBS, the BBC's US partner, said the justice department review included interviews with multiple witnesses who may have knowledge of how the classified documents were handled.
White House lawyer Richard Sauber said the president is fully cooperating with the Department of Justice to ensure the files are stored properly by the US National Archives.
The discovery of the documents have been called a political embarrassment for Mr Biden, as it comes during an ongoing investigation into former President Donald Trump's own alleged mishandling of classified files.
Speaking to reporters on Thursday morning, Mr Biden said that his lawyers immediately notified officials when the first batch of files were discovered at the Penn Biden Center in November.
Mr Biden added the additional documents found were locked in a garage next to his 1960s Chevrolet Corvette sports car, "not sitting out in the street".
"People know I take classified material seriously," he said.
Mr Biden said his lawyers reviewed other places where documents were stored from his time as vice-president, between 2009 and 2017, after the first files were found, and that review was completed on Wednesday evening.
"The lawyers arranged for the Department of Justice to take possession of the documents," he said.
Mr Sauber said in a statement that the additional search uncovered "among personal and political papers a small number of additional Obama-Biden Administration records with classified markings".
All but one of the documents were found in a storage space inside the garage of Mr Biden's Wilmington, Delaware home, he said.
"One document consisting of one page was discovered among stored materials in an adjacent room," Mr Sauber added. Lawyers also searched Mr Biden's Rehoboth Beach home, but found no additional files.
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