A watchdog agency learned in February that the Secret Service had purged nearly all cellphone texts from around the time of the Jan. 6, 2021, attack on the Capitol, but chose not to alert Congress, according to three people briefed on the internal discussions.

The Secret Service erased text messages from January 5 and January 6, 2021, according to a letter given to the January 6 committee and reviewed by The Intercept. The letter was originally sent by the Department of Homeland Security Office of Inspector General to the House and Senate homeland security committees. Though the Secret Service maintains that the text messages were lost as a result of a “device-replacement program,” the letter says the erasure took place shortly after oversight officials requested the agency’s electronic communications.