The FBI is searching the Maryland home and Washington office of John Bolton – who served in US President Donald Trump's first administration as national security adviser but later became critical of the president – as part of an investigation into the handling of classified information, a person familiar with the matter said.

Bolton was not detained and has not been charged with any crimes, said the person, who was not authorised to discuss the investigation by name and spoke to The Associated Press on the condition of anonymity.

After the search at Bolton's home started, he was spotted on Friday morning standing in the lobby of the Washington building where he keeps an office and talking to two people with "FBI" visible on their vests. He left a few minutes later and appeared to have go

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