The Department of State Services, DSS  Thursday said it has executed valid search warrants on Tukur Mamu's resident and office and several incriminating materiald including military accoutrements.


The DSS  in the terse statement signed by its Public Relations Officer, Peter Afunanya  added that different currencies and denominations including financial transaction instruments were also recovered. 


It further added that  the investigation continues.


Mamu, a journalist has been the negotiator between the families of the kidnapped  passengers of  the attacked train and the  terrorists holding them hostage


He was recently arrested by the Egyptian authorities and handed over to the DSS