Your question seems to be referring to a controversial aspe…

Your question seems to be referring to a controversial aspect of the 1993 World Trade Center bombing case. After the attack, it was revealed that the FBI had an informant, Emad Salem, a former Egyptian army officer, embedded in the group that carried out the bombing. Salem initially was supposed to help the FBI by providing valuable information about the group. However, he withdrew his help months before the attack due to disagreements with the Bureau, leaving them without insider information on the group's plans.