An investigator with the Department of State Services (DSS) has told the Federal High Court in Abuja that complaints made by victims against alleged terrorism negotiator, Tukur Mamu, corroborated the findings by the agency. The sixth prosecution witness in the ongoing terrorism trial of Mamu said several victims rescued from the 2022 Abuja–Kaduna bound train attack lodged complaints with the DSS. The witness, a DSS operative, made the disclosure while being cross-examined by defence counsel, Johnson Usman, SAN, before Justice Mohammed Umar. The witness told the court that he interviewed six victims during the course of the investigation. The witness replied, “No, my lord.”The witness also confirmed that Mamu told investigators he was a publisher of a newspaper and magazine, and that his income was derived from journalism.