The topic of attacks on U.S. soil also resurfaced Friday in other recorded discussions. Daud in one tape suggested that their emir could one day send them back into their home country. Abdirizak Warsame — a co-defendant who pleaded guilty in the case earlier this year — boasted about being able to make homemade rockets. And Farah was recorded as saying he had heard that thousands of ISIL fighters had been sent back.

“You know what they did? They acted like they were Syrian refugees,” Farah said. “Italy, U.K., they just went with the wave.”

Omar then talked about getting ISIS fighters to come into the United States through Mexico, according to the audio recording and transcript.

He said he wanted to “go through Mexico to learn all the spots there, make connections there, send some brothers back over there,” according to the recordings.

“They’re coming into this country as immigrants … Imagine what they could do. They’ll do crazy damage,” Omar said. “Wallah [I swear], we have a big opportunity.”