U.S. law enforcement is investigating whether a woman took a laptop computer or hard drive from U.S. House of Representatives Speaker Nancy Pelosi’s office during the Jan. 6 siege of the Capitol and tried to sell the device to Russian intelligence, according to a court filing.

Ms. Williams’ case is among more than 200 that have been opened since the president’s supporters forced their way into the Capitol building as lawmakers met to confirm Joe Biden’s election win.

Riley June Williams, 22, was detained in Pennsylvania on charges of violently and illegally entering the building, and disorderly conduct.

A former romantic partner had said in an affidavit Ms. Williams intended to sell the data to Russian intelligence.

The witness “stated that Williams intended to send the computer device to a friend in Russia, who then planned to sell the device to SVR, Russia’s foreign intelligence service”, the affidavit said.

The transfer of the device “fell through for unknown reasons”, the witness is alleged to have said, “and Williams still has the computer device or destroyed it”.

Ms. Pelosi’s deputy chief of staff, Drew Hammill, tweeted two days after the attack that a laptop had been stolen from the speaker’s office but it was only used to give presentations.