In a new filing, Assistant U.S. Attorney Joe Thompson writes that defendant Mukhtar Shariff “knew about the bribery attempt” and deleted the encrypted messaging app Signal from his phone when Judge Nancy Brasel ordered the defendants to surrender their devices to the FBI as the trial was concluding.

The deleted app included texts that Shariff’s co-defendant Abdiaziz Farah sent about the bribery plot, as well as a video of the cash delivery. But Thompson writes that even though investigators could not find the complete set of messages between Farah and Shariff, FBI digital forensics experts recovered notifications of incoming messages to Shariff’s phone from Farah.