An independent special investigator is to investigate the discovery of various secret documents in the private rooms of US President Joe Biden from his time as Vice President.

This was announced by US Attorney General Merrick Garland on Thursday at a short-notice appearance in Washington.

It had previously become known that classified information was not only found in a former office of the American President, but also in another location.

The White House said a "small number" of documents were found in the garage at Biden's Wilmington residence.

The special adviser to the American President, Richard Sauber, did not say exactly what was involved.

It is working "fully" with the National Archives to ensure all Obama-Biden administration records are properly in their possession.

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