The latest development in the Jussie Smollett attack

According to two federal officials, the FBI and U.S. Postal Inspection Service are investigating whether Smollett played a role in sending a threatening letter before the alleged attack.
2:09 | 02/20/19

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Transcript for The latest development in the Jussie Smollett attack
Where they were seen today. And federal authorities are now asking questions about the letter that smollett said was sent to the show he's on, "Empire." ABC's Eva pilgrim from Chicago again tonight. Reporter: Tonight, police investigating whether "Empire" star jussie smollett himself played a role in sending this racist, threatening letter that arrived at the Chicago studio before the alleged attack. Smollett jussie, you will die black . There was no address. But the return address said in big, red, you know, like, caps, "Maga." Did I make that up, too? Reporter: A law enforcement source telling ABC news the brothers in this surveillance video alleged smollett was upset that the letter didn't receive more attention and say the actor then paid them to help orchestrate and stage the attack. Detectives are working to investigate that claim. Tonight, the brothers seen leaving the courthouse with their attorney providing no comment. Police say they were continuing to cooperate with the investigation. Authorities are waiting to question "Empire" star jussie smollett about the alleged attack. I can't tell you what color their eyes were, and I did not see anythin the second person, I saw running away. And the first person, yeah, I saw his stature. I gave the description as best as I could. Reporter: Smollett denying he was involved in the attack. His attorneying telling ABC news he is angered and devastated by reports that the perpetrators that he is familiar with. He has now been further victimized that jussie played a role in his own attack. Nothing is further from the truth, and anyone claiming otherwise is lying. Smollett's team has reached out to legal heavyweight mark gare goes, who has represented high profile clients like Michael Jackson. They talked to him about representing smollett. No decision tonight. David? Eva, thank you. Next this evening, Bernie is

This transcript has been automatically generated and may not be 100% accurate.

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