Two men characterized by police as “persons of interest” in the reported attack against “Empire” actor Jussie Smollett are now considered suspects and have been arrested on “probable cause that they may have committed a crime,” a Chicago police spokesman said Friday.

Chicago Police Department spokesman Anthony Guglielimi said the men are in custody but have not been charged in the Jan. 29 attack reported by Smollett.

Police have identified the men only as two Nigerian brothers. Police have been questioning them since they were picked up by officers at O’Hare International Airport on Wednesday after returning to the city from Nigeria. On Thursday, police served a search warrant at their home.

Guglielmi said at least one of the men worked on “Empire,” but he does not know in what capacity.

Smollett, who is black and openly gay, has told police he was taunted with homophobic and racist slurs and was physically attacked while he walked in the Streeterville neighborhood early in the morning. 

This is a developing story. Check back for updates.