Former US President Donald Trump may have concealed documents during an FBI search of his property in June, Department of Justice officials say.
In a court filing, the department said "efforts were likely taken to obstruct the government's investigation".
They alleged agents were "explicitly prohibited" from searching a storage room at Mr Trump's Mar-a-Lago mansion.
Other records were likely "concealed and removed" from a storage room, the officials said.
The 54-page filing was released on Tuesday, before a court hearing on Thursday.
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